it's not improvement - it's just re-enforcing. You don't have to but I do. I have just heard stories of firewall breaking off and that alone was enough to scare me. Basically, I placed the nose facing down and dribbled epoxy glue down into the corners of the firewall. that alone probably does a lot. But, I also took a small piece of angled wood and dropped it down into that corner. Use a long wire to move it around and to press it down. I used the side holes to get to it. Right below the original fuel tank would be is the landing gear mounting block. It just feels thin. I basically epoxied the whole bottom ( try very hard not to get into the blind nuts) and laid a few pieces of wood behind it (goes from one side to the other). Hard to explain. Also, the wing bolts mount into the walls - I placed a round dollar size plywood and epoxied that to the hole so that when the bolt goes in it has something more solid to rest up against (the dollar size plywood also has the same size hole in it). On the canopy I cut out the Grey bottom where the pilot dude sits on. That really lightened the canopy. I put a cross beam on the canopy and mounted a 1/5 scale Great Planes Pilot. Looks much better. My plane is Right Heavy - due to the OS FS91SII cyclinder. I haven't done it yet but with everyones help and idea's on this forum I have decided to put some weights on the tip of the Left wing. For some reason at the bottom of the loop the Right wing drops every time. I can anticipate it and correct it with stick control but it's beginning to bug me. Oh, also I built a bridge that goes from the original fuel tank area to the front of the wing tube. my fuel tank rests on that bridge. because the tank comes back it made it near impossible to put the front wing bolts in. I now use a dubro black nylon wing bolts and cut short for the front. I use just the socket from a socket wrench set to turn the wing bolt - cuz you can't get a tool in there (especially when there is a fuel tank in-between). I also used rare earth magnets (8 pieces) on the back of the canopy to secure it. no bolts - I just have to pry it open with my nails to get it to open. those magnets are strong. there 1/8 in. thick and the diameter is about the same size as a #2 pencil eraser. I'll try to post a picture or two - sometimes this week. tooo tired right now.