For gluing up flat sided resin kit side pieces use styrene cement and attach a 90 degree angle piece to one of the resin sides. The styrene glue will hold the angle top the resin side then line up the other side and do the same thing. The styrene glue will hold the pieces together so you can then use super glue to bond the side permanently. Then the angle can be knocked off if wanted. I learned this from the owner of Funaro and Camerlengo.