I doubt they will be able to build 200 per month. If they can get even 50 per month, as you said, the damage to Russia would be great. 200 per month would be catastrophic for Russia.
This source (Ukrainian so not so trustworthy) says production is around 1 a day at the moment with plans to reach 7 a day in October.
www.pravda.com.ua
Perhaps that target will be missed. In Ukraine's shoes I would focus efforts on Flamingo production at the cost of other programmes because the effect of disabling refineries is so great
- disruption of transport
- curtailing of exports of refined products, losing desperately needed export revenues
- negative effects on industry
- cost of refinery repairs
I read that the latest attacks have closed down another 8%-10% of refining capacity. Depending on how fast these refineries can be repaired, Ukraine may be able to reduce refinery output by 50% or more. That would give Russia extremely acute fuel shortage problems. Transport and industry might descend into chaos.
I look forward to port crude loading facilities (and pipelines to them) being targeted in a big way as well, significantly cutting revenues for the government from crude exports.