I'm flying mine on electric so I cant really help much in the glow area but I would do a .90 size if you want good performance.
As for the landing gear, I simply taped over the blind nuts in the bottom of the fuse and thinned out some epoxy and recoated the entire gear area from inside to help strengthen the area. I was pretty green when I first got mine and have had some pretty hard bounced landings and so far the gear has held up very well with no signs of structure damage.