I'll try and get a bit more done on the swing arm this weekend.
I did a quick sketch of the basic 4" of travel, but hope to get another 2" of un laden travel as well. Unless I can get hold of a better rear shock, I had a quick look and it seems these 'Fox' Shocks are dear.
I havn't done any proper calculations or checks, but I'm guessing this linkage rear should give me a multiplier of around 4:1?
But will work that out soon.