[Bob the Angry Potato]

The motor's actually fine- you can keep that stock, really.
You'll have trouble putting side-rails on it, I find there's not very much free room at the sides, and what free room there is can be obstructed by the bipod, assuming you have the F1. If you have the SV, it's possible, just fairly hard. With anything on the rail of the F1, you probably wouldn't be able to fold down the bipods. Considering you want to get a Smokey's bipod, I assume you'll have the SV.
Scope mounts are available at WGC, and are quite efficient. Go for it.
As for the M100, it should boost your velocity to the 330 FPS area, as it did for another. No gear/bushing modifications, as far as I know, are needed for this. There will be a slight drop in rate-of-fire, though, but not very much... besides, with 17 RPS, it doesn't really matter.
A tightbore is also a good investment, is should boost the velocity and accuracy even more.
The last two upgrades, I plan to do on my FA-MAS, the parts have not been ordered, yet.

I have already discussed this with you, but that handle (in my opinion) is beastly, and has to go. However, you intend to keep it, so be it. I'm removing mine and replacing it with one from a G36C.
You should have it firing at about 350 FPS fairly easily.