Plenty of tips, take your choice. One from me that is in my opinion the best, but don't know if it's still available. This is a product called an A-Justa- Jig. It's totally possible when using this to build a wing in it's entirety including all the sheeting,(except a small area on lower center section). With or without dihedral. It will be positively straight and true. The fuse can also be built on it if you obtain the added fuse kit. I used it though only for wings. While in this jig it can be rotated in any angle to enable working on top bot or where ever. As I said don't know if still on market I got mine 25 years ago. I think I will search and see if can find.