Orientation house

Should work, or am I overlooking something?

Yes, namely that without an explicit exception, the aforementioned principles of § 6 para. 4 and 5 BayBO apply to the distances of the buildings, which refer to the height H and then only demand at least 3 m. In case of doubt, therefore significantly more than 3 m!
It is therefore not about retaining walls.

You have to determine how high your building should be for the value "H" and what factor applies there in the building area for the value of the height "H", possibly 1.0 (pure BayBO), 0.5 (in core areas), 0.4 (by statute). A call to the building authority makes you wise.

Hi!

I voted for B.

E/W roof / solar orientation.
In terms of maximum yield (feed-in), you will lose 5-7% compared to south.

Regarding the possible optimization of self-consumption (sensible, since feed-in tariffs are low and decreasing), E/W is not bad, on the contrary.
You don’t necessarily have the full peak power at noon, but distributed over the day.

Our collector for thermal solar is exactly east-oriented.
The upcoming solar system (photovoltaic) will have 15 panels east, 13 west.
About 2*3.7 kWp with a small 2kWh buffer battery.
PS: I’m currently learning that the system will be installed next Wednesday.

Best regards
Thorsten

Clearly B - in the DG, floor-to-ceiling windows facing S are possible