1) In my descriptions, there weren't "doors." It's more like SpaceX where the halves drop completely away (albeit tethered). So you could fit MORE chute than you could if you were worried about it having to slide out as in a pyrotechnic ejection.
2) Parts of the system are diameter-specific, but the point I was trying to make was that you should be able to snap out the electronics and move them from rocket to rocket. So you could snap out the electronics from a Pro-Series 2.6" rocket and snap them into a 5.5" L3 rocket. Same electronics. Different diameter plastic couplers they snap into. I realize that's hard to imagine, but I'll try to bring it to life soon.
3) I did mention that weight would initially be a factor, but maybe not too dramatic, and I think it will be worth it for reliable, clean, always-apogee deployment with the convenience of Chute Release (though it's different than Chute Release).