After that, I marked the edges on the torque-box side and used a carbide bit and grinder to clean off the metal where the weld would hit.
In order to seal any gaps - and add even more structural integrity - I always cover my patches with "kitty hair", a fiberglass re-enforced filler. Although this area will be forever hidden once the bottom plate is welded on, one can forsee moisture from puddles getting in there, so it's critical not to leave any spaces or surfaces where water could penetrate and sit. Oncethe filler is dry I'll smooth it out and apply a black undercoating - prior to welding up the bottom plate.
Tomorrow, the last piece to go on will be the bottom plate. This will enclose the torque-box and add much needed strength where the frame meets the front substructure. Almost done this side!
Don't forget to check out the website at www.E-tekRestorations.com !