Good luck with it all - sounds like you have a good idea in your mind of how it will all come together!

And on the zips - I've never had an issue - just make sure that you unzip them both as far as you can to take the pressure and stress off the zip. And a great hint I picked up on the forum - tie a big loop of paracord to each zip on the inside - this lets you ''reach'' down with your toes once inside and grip and pull the zip to you - saves sitting up and reaching. I also put a luminous beta light on the inside and outside zip handles for easier entry and egress - lets you know exactly where the zip is without having to feel around too much in the dark