magnetic Square for plane building

I like the idea. the kind of magnets he uses are unavailable locally. I remade it on Alibre same outer dimensions but added a 15mm depth for a solid feel. Put some gussets etc on the inner corners. I added the holes for those who like to stick things thru to help the model stay in place and the lines in the magnet bay are to add surface area to help the magnet stick. I planned to use cheap Ferrite magnets. Love tools that help me build straight.