1) Can you stop at the synthese stage when get oil separation and is that the A oil ( free base) pure ?
UkspiceYes, you can 'stop' there as your target product is amphetamine freebase, which is already obtained here.
The product is not pure.
It can be purified with a steam distillation under vacuum, IPA needs to be evaporated and additionally you could extract leftovers of solids with DCM, which is not 100% necessary but makes the product cleaner.
2) How much A oil much would you expect to yield ?(500ml to 600ml )????
Yield can be from 70% to 80%, I have heard of people reaching higher yields. It all depends on your skill and lab equipment/conditions
3). Does anyone have a setup that can do like 10kg batches at a time complete lab list and possible source to buy full setup ?
As you fill reactors 50% of their whole volume you can expect to create between 1L - 1.15L of Amphetamine Freebase in a reaction mass of approx. 50L (100L reactor), to get 10L you'd require a reactor of 1.000L volume and there is no proof in this forum right now that this route can be scaled to such a high RM without a too big loss in yield.
For the quantities you are looking for the ideal route would be to create P2P and then proceed with a Leuckart or use a hydrogenation tank with a catalyst which can be done in incredibly high volumes (1.000L or more)