I don't think you are going to get all of that and be anywhere near $700.
I've sold a lot of Veprs. In 2005 we were Robarms 2nd largest dealer. Towards the end, before Robarms ran out of them, Alex raised the price on the new guns by $100 each, which put them into the $600 range.
The slotted handguards were a $50 option. (if I recall correctly).
The folding stock was approximately a $200 option. No that isn't a typo. I belive it was $180. And even then, I don't know if Robarm had actually sold any of them yet.
A good smith with the right tools will usually charge around $80 or so to thread a barrel. If you're going to suppress, make sure whoever threads your barrel knows what they're doing. The threads have to be exact, because if it is off in the slightest, you will get baffle strikes.
When the new guns come in, I'm not betting on them being nearly the price they were before. Which sucks, because my customized 7.62 Vepr is my favorite rifle. And in the $500 range I could sell Veprs all day, but in the $700+ range, that ain't gonna happen.