If it uses a pow 1 bloc, even a single old reactor (3D crosses version) then it conflicts with the current version of the game. My advice would be to make a separate install of STARMADE, choose a 1.99 or so version of the game instead of Latest, install it, then copy-paste the backup and try to use it there, in the 1.99 install. I hope this can help.
Edit: After that, you may try to erase all old power and whatever does not fit in pow 2.0 and then work on it from there, in the newest version. Or keep your build and the 1.99 version and delete the incompatible new version... Everyone say 1.99s are more stable than 2.00s and have way less bugs.