May be too late but ... Asa Moyce of Bartel Engineering makes the aluminium tanks (fuel and oil) that just about everybody uses. He could not be more helpful and supplied me with a set of plans to make all the brackets that are needed for fuel tank, oil tank, footrests, seat, etc. These plans were developed/drawn by Asa and Bernard Saunders and are pretty well "right"! They are only hand-drawn but contain all the detail a good fabricator needs. I had Terry Mead (Kent) do all my frame modifications and he did a super job for £600. Everything fits more or less as it should. All I had to do was get it painted and assemble it!