Jim,
This kit came with one center truss I assumed there would be three. Also the end and side wall inside 90 degree corner joints are not very rigid. What I did was to use the molded center truss as a template and make to additional two additional trusses using Plastruct 91105, .060inch thick styrene sheet, Plastruct BFS-5, 5/32 inch styrene I-Beams and 3/32 inch by 1/4 inch styrene rectangular strip to make these trusses. The rectangular strip was used as the vertical ends of these trusses, this strip and the kit wall form a T-joint when glued together, also not knowing the type of plastic used in this kit , I used Platruct plastic weld solvent this cement is recommended for bonding dissimilar plastics.The other issue is to rigidity of the inside corners or the end and side wall, as I was building this kit I cemented Plastruct 90506 1/4 inch right angles to the inside edge of the 90 degree wall joint. My e-mail address is in my personal information, if you contact me via e-mail I can scan the shape of these styrene trusses to you. The important issue is the span of these new trusses and the pitch of the I-Beams for roof attachment. The kit molded truss is applied at the mid length of the side walls, this leaves the portion of the wall from this truss to either end wall unsupported, apply this new truss midway between the end wall and the kit truss, both sides of the kit truss, what you are doing is is to have all trusses at quarter point connections.
