mz 250 etz café racer

Hi All.
My name is Piotr, and I am from Poland. I'm sorry but I can't send private massages because I'm new. That is why I write here.
This black MZ 250 cafe racer is the best I have ever seen. For sure.
I have couple of question for Romain about this bike, and will be very grateful for any answers:

1. What is the gas tank of this bike? (looks like from mz trophy?)
2. What is the size of the wheels?
3. Did You change anything in the frame?
4. Is the front light original (from etz250)?
5. What material is the seat made of?

Sorry but I can't speak French, and google translator is not so good in French-Polish translating. Thanks for any response! And can't wait for your next project:)

Welcome wechman you have to present you again at the right place ,there:
https://motoancienne.superforum.fr/f5-presentez-vous
and the contact will go on, it's the use between us to welcome you then by this way

To join Romain you' ll maybe have to wait a bit cause of his job...so you will have the time to tell more of you, your bikes, your projects...