Are the financial resources really sufficient??

Hello everyone,

my wife and I currently already own a house, but for personal reasons, we want to move out there in the short term.
We have already spoken with some home builders and providers such as Weberhaus and local architects.
We would like to build to realize our dream of owning a home. However, with such resulting high debts, we really have some concerns and would therefore like to ask for your opinion/assessment on this.

Income:
Husband: €3,000/a (including company car)
Wife: none, but looking.
Equity: approx. €80,000 (current house) + €20,000 savings

Expenses:
House: approx. €230,000 (ALL IN prefab house, incl. (underfloor) heating, tiles, etc.)
Land: approx. €80,000
Additional costs: approx. €35,000
Interior: approx. €30,000

So we would still have to finance €275,000 via loan(s).
Based on the very meticulously kept household budget, we could spend max. €1,000/a, preferably less of course...
This calculation already includes €200/month set aside for the house and additional costs such as utilities etc.
If my wife finds work, we would like to set aside that money for vacation and extra expenses (luxury).
Since, as mentioned above, we have concerns about the high sums, we would like to choose a loan with a long term.
Of course, the banks and providers would give the green light in the current situation…
But since we do not want to trust them blindly, we are very happy to have found this really great forum!!

Furthermore important:
One child (8 years old) and one child (16 years old - already in training and thus has own income for clothes etc.)

What is your opinion on this plan??

Is it feasible??
And if yes, which financing would you recommend to us??
Or is €1,000 too little for such a high amount??
We certainly do not want to overextend ourselves or pay off forever.....

Thanks in advance for all upcoming answers!!

Of course, between 2-3 percent repayment