That looks just like my Dekley did after going through a "suspicious" club fire in late 1980. The fire was actually at the other end of the building, but the heat was so great that microphone holders on stage melted, keyboards were warped beyond repair, and amp grill cloths were burned or singed.
The good news is that my steel survived with no parts replaced!
I took it to a self service car wash, laid it on a rubber mat and washed it thoroughly with engine degreaser and tire cleaner. I wiped it down as good as I could, then took it to a garage and blew it out real good with compressed air. I took it home and cleaned off the stubborn soot with rubbing compound and Windex, re-lubricated all moving parts, and was back playing it again within a couple weeks.
No parts were disassembled or replaced and the only sign of the fire that remains is that the chrome legs and knee levers still show some yellow from getting hot. Hopefully this will work for you and save a major reconstruction/rebuild.
------------------
Jim Smith
jimsmith94@comcast.net
-=Dekley D-12 10&12=-
-=Fessenden D-12 9&9=-
-=Emmons D-12 push pull 9&4 (soon to be 9&9)=-
Stereo Steel rig w/Boss GX-700
IVL SteelRider w/JV-880