Thanks for all your trouble. Just got back home and checked e-mail...
That's fairly major surgery! As I understand it, it is now a matter of welding the LHD cowl to the rockers and floor of the remains of the pick up tub?
What I have had in mind was to take off the dash panel and the firewall from under the cowl to the bend where the firewall bends Out of a rusted out LHD tub. My thinking was to be able to do it one piece at a time - 1st the RHD dash off and then immediately weld the LHD dash in place - 2nd remove the RHD firewall and then immediately weld the LHD firewall in place. All of this with the tub bolted to the frame... getting the door openings right is my big fear.
Your frame and axles looking real good. The nice part of the job is on hand. Time to pull on the white gloves and start assembly.