Good morning-Jetmodeler; I have read your post and I have to ask you a question. Are you building this ship like a papermodel? The reason is, most papermodels have you NOT gluing the sides of the hull except at the top(main deck) and bottom(bottom hull plate). You can,t build this way in heavier stock unless you do two things. The first is to make sure that ALL your profiles at the deck and bottom are SMOOTH and correct. Second, make sure you contour your pieces BEFORE installing them on the ship.When I do papermodels(Which I think are a lot of interesting fun) I keep a spritz bottle handy and a large spoon.I spritz a little and then shape the part using the spoon.I do this so when the hull is done, unless I,ve made a boo-boo, it looks like a plastic hull.You can,being as how you are using heavier material put a little tab that,s folded at 90 degrees from the frame in the center, equidistant from the deck and bottom.Don,t make it too big.Then just a little spot of ALEENS craft glue should help you get the contour you want.I use this trick on the larger, 1/200 and above papermodels.I find on the smaller ones if I spritz first,form and install, I have to do nothing else. You can form many things this way,and,oh yes you CAN do compound curves this way in plastic, without the spritz of course. Good luck and let us know how you are doing. happy holidays !!!tankerbuilder p.s. when you use the spoon, put a small piece of thin foam under the piece,it will form better! This means a lot when you need that curve.