Ilied. Iused square stock rather than tri-stock for the firewall support.

I think that you can see why reinforcing the landing gear braces is tough.

In retrospect Imight lay down a piece of 1/8 x 1/8 stock on the inside of the wing's belly pan side rails to keep them straight. Gives you a side rail to glue them to rather than depending on thin CAto tack the contact points to thin sheeting and keeping them in a straight line and keep them formed to the curve of the wing bottom.

If you want any other specific picture of a structure let me know and I'll see if I have it.