Mitch

The sequence on the last pics are reversed.

The rear horizontal drag strut/engine down strut/seat tube struts cluster plate required a lower spacer block/plate and a mains axle bracket on the underside. This required blocking the main engine mount tube to keel with a brace/block of wood and carefully undoing one engine support tube pulling it aside remove the bolt running down thru the keel and inserting a longer one.

I found by doing this I could slip the block and axle bracket up underneath onto the bolt.
Note the bottom U channel brackets on both sides which used to hold the rear drag struts had to be removed permanently. This recquired unbolting each side of the seat tube rear support struts one at a time.

In this pic you can see the Silver bolt head on the black U channel bracket. It is the longer thru bolt and you'll notice the square 2" X 1" deep spacer block and new mains axle bracket, although it will not carry a main axle. Rear brace tubes are attached via the U channel connectors you see in the last two pics.

Note the rear and front brace tubes are I have referred to as axle/drag axle supports previously, when they are infact known as the rear and front support tubes.

This all went to plan, without any problems.