a photo its a huge help, I think I posted this in the last thread but make sure the gear is tight in the slots.
some triangle stock to brace the plywood area at the formers on each side is not a bad idea or fiberglass as suggested.
the stringers are a easy fix,just split the former and replace them, just CA them in and they will be fine the main load is taken up by the plywood piece the gear slides up against, the sheeting will support the load of the gear plate after all the parts are glued in.
when you re-sheet the area you might want to wet the sheeting with windex or alcohol and water 50/50 to make the wood more plyable for bending arround the fuse I have done this repair twice on my NEXTAR and it seems to be a weak spot until you have a pair of gear totally destroy a fuse on a hard landing.
as long as the gear slide in tight you will be good to go the plastic lock won't work well unless it slides in smooth and without any slop I found this out the hard way when I repaired mine the first time and my gear wouldn't lock into place and wanted to fall out had to re-repair it, then I broke them again but it was a easy fix after the first run through,trainers are made for crashing and repairing.
mine still lives semi retired waiting for a, recover,floats, and a wing straitening,so it looks more like a Cessna, planning on powering it with a OS61.
trainers never die they just turn into something else,unless you turn them into a pile of sticks.
good luck your repair doesn't look too bad at all I crashed and repaired mine much worse than yours and it flew really good still.