Ian,
interesting that you were able to make those comparisons with Pauls. When I measured the height of mine, it was 41.5" with a ground clearance of 4"front 5" rear.
Of course you also had the windscreen replaced, so we know the DAX is ok on that score too.
Me being 6' 1" tall , I benefit from the extra height too, I sat in the drivers seat of Steve Barkers first 40 (KVA) and no way could I have driven it without moving pedals and a Gurney bubble.
The front and rear suspension arms look like they are KVA, but the rear upright may be unique to DAX.
Dave