SpeedStick, you are welcome:). Here are the answers:
1. Yes, Nickolay is making them non-stop, usually a couple of orders at a time. As each of the orders is typically non-standard (stick grip used, the set of electronics, control panel layout etc.) it's difficult to say how long a particular order will take. My config has taken about 3 months, but it was quite unusual, with Warthog throttle/ grip, VKB controller/ sensors, Thrustmaster MFD Cougar button panels; besides, I've assembled all the electronics myself (you can see it in the attachment). And we had quite a lot of iterations exchanging the sketches and photos to optimize the layout. You'll need to define your "dream system" and discuss it with Nickolay- but then you are guaranteed to get exactly what you want.
2. Yes, it's possible.
3. Correct. $350 for a typical HOTAS, $450 for HOTAS+pedals. However pedals can be ordered separately.
4. We've discussed it with Nickolay just two days ago. The initial design didn't allow for easy grip swapping; the stick was detachable from the gimbal, but the wiring wasn't. I've added a connector there, so in my configuration the stick+grip combination is swappable (it was not yet introduced at the time the pictures below were made); of course you'll need an additional stick tube for any other grip you'll be using. As there is a demand for using a Cougar/ Warthog grip with a stock nut/ connector Nickolay is planning to introduce this option in the nearest future.
5. The whole project has started as a possibility to offer a drastically better gimbal/ control configuration for x52 owners who would provide their HOTAS to be upgraded. So you'll need to purchase a "donor" HOTAS first (x52, Cougar, Warthog etc.) and send it to Nickolay; or alternatively the "donor" can be purchased locally (of course it applies to current products only); or it can be found/ purchased on eBay (as I've purchased a Suncom F-15 that will be my second grip)... In other words, the price of a "donor" HOTAS is not included in the above mentioned $350.
Hopefully you've got a better picture now; still don't hesitate to ask more specific questions. I've agreed with Nickolay that the mails can be sent to his address that was provided by Sokol1 in his latest post #16 above; I'll help him with the translations.