scott sorry no pictures but they all crack round engine mounting bolts as you getting new rails made I would just fold up a pair of rails small enough to fit inside your new rails about 7inches long and centre them under where motor sits and stich weld in.
re drill engine mounts ad should be fine
when welding in gussets don't fully weld just small stich weld from rail to rail weld both at same time to not make metal too hot as it can buckle
