House construction in Bavaria... Feasible?

Ahem... Prefabricated houses are mostly timber frame construction

But not every timber frame construction is a prefabricated house.

In terms of price: prefabricated houses are currently mostly more expensive than solid houses.

That’s why I wouldn’t buy a prefabricated house either. Pricewise, they almost reach the level of custom-designed houses.

Creepy experiences... Which ones? From which construction years?

Creepy experiences basically depend on the execution. With a messed-up plan and a doubly messed-up execution, even the best concept will be botched.

Admittedly not in Germany. However, the construction method has 4 intrinsic disadvantages:
a) Low heat and water capacity, i.e. poor thermal insulation and possibly poor climate
b) Low sound insulation
c) Strong transmission of structure-borne noise.
d) Usually, there is a necessary vapor barrier directly under the inner shell. Holes and execution errors here can cause problems very quickly.
Sure, you can try to compensate for these points with elaborate solutions, but then it gets expensive and it won’t be optimal.

That's why I wouldn't buy a prefabricated house either. Price-wise, they almost come close to custom-designed houses.

Prefabricated houses can also be custom-designed – this is even relatively common.

Admittedly not in Germany. However, the construction method has 4 intrinsic disadvantages:
a) Low thermal and water capacity, i.e. poor thermal insulation and possibly poor climate
b) Low sound insulation
c) Strong transmission of structure-borne noise
d) Usually, a necessary vapor barrier lies directly beneath the inner shell. Holes and execution errors can cause problems very quickly.
Sure, you can try to compensate for these points with elaborate solutions, but then it becomes expensive and won't be optimal.

This is not a question of the construction method 'timber frame construction', but a question of planning, design, and choosing the right solution. Cheap stays cheap, and cheap masonry also quickly results in cheap quality and problems. And high-quality 'timber frame construction' does not have these problems – just like a high-quality 'masonry' solution...
Reasonable timber frame construction methods nowadays differ significantly from the typical implementations of the 70s.

This is not a question of the construction method 'timber frame construction', but a question of planning, design, and choosing the right solution.

No, these are the fundamental physical disadvantages of timber frame construction, even if the prefab house industry presents it differently in their publicity. As mentioned, one can try to suppress the problems through elaborate solutions and maybe even achieve better results than in a poor solid house, but it is the disadvantage of the system. And I would even go further and claim that a prefab house comparable to a solid house in terms of heat capacity and sound properties is more expensive.

Actually, the OP initially only had a question about his cost planning...

Bricks or wood are obviously treated like a religious issue here, yet nobody knows what the OP actually wants to build. How can one then philosophize about advantages or disadvantages without even knowing the material being used?

Soundproofing is still the most common myth encountered here. Regardless of the fact that I am convinced soundproofing in a house does not come from the material in the wall, I would like to throw the following numbers into the room (sound insulation is given as the RW value in decibels):

11.5 cm plastered masonry approx. 42db
Timber frame both sides OSB + drywall + mineral wool in the cavity approx. 43db

Both values may gladly be checked via a well-known online search engine, I am not allowed to insert links here...

So much for this "physical disadvantage," but nobody here knows what the wall construction actually is. Both can be done significantly cheaper and will accordingly have other (but also comparable) values.

The 2nd "physical disadvantage" is then the heat capacity? Since you probably don’t mean the U-value, I assume the other myth about stone as a heat storage. A modern brick for efficiency houses generally does not have as much mass as many think, but here I recommend trying it yourself.
Simply buy a KVH squared timber, a Poroton, aerated concrete, and sand-lime brick at the hardware store and store them in the house until they reach room temperature. Then take everything outside (of course when it is cold) and touch it again after 10 minutes; this gives a nice impression of heat storage.

It’s actually a wonder that no one has said anything about fire protection yet... Seriously, one can only discuss the advantages and disadvantages of both construction types if one has a direct comparison. So wood house builder A builds his walls, ceilings, etc., like this and brick house builder B does it that way. As already noted above, both exist in high quality and also simple versions.
If the build quality of the compared companies is identical, then by the way the purchase price will also be identical, regardless of which is above or below.