Well, I want to know how you plan on getting plastic 300' away without hop up.
High fps (long/big cylinder with lots of air volume)? Plastic pellets?
How are the 'mags' going to work, or will it be a built in tube that you feed into?
Lastly (for now), do you have the body/receiver done?
The great thing about your project is that I've been thinking of doing something like this, but not as extreme (just a custom parted VSR or the like), because even though I love my ASR, it sometimes makes me very mad when it fails on me.

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I love what your doing, and since you seem to be building several at once, I assume you are going to be selling. If so, I call dibs (unless I can't get enough cash even if I sell my car to buy one).