Work now well underway,
Calculating it, It's gotta be 18 years since I welded last
New welder works a treat, had it singing from the off and in a "flash" the front part of the new subframe is fabricated and installed. I'll do the rear part tonight. This is the left hand base installed in the right hand side, it's universally the same for mounting and fabrication purposes.
Ive designed it so the seats can be bolted to the top tubes and makes use of existing minor seat mounting holes and doublers. Ignore the inverted cavity wall fixing at the back, it's just there to provide a temporary fixing for the rear part of my new subframe as it had a thread the correct length. 10.9 grade bolts with washers and nylocks will feature in the completed project. In these pics there is no support at the back, just the bolts into the existing seat mountings up front.
I'll be able to make these subframes for interested parties in the future for simple bolt in fitting at home because the seat rails to subframe interface is bolted. All that is needed on the seats themselves is the drilling out of rivets on the base rails and grinding off of one weld.
The frames will be painted black for aesthetics when I'm done.