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@Baerli_Baer
Excellent project. This looks lovely. Have worked on 3 myself (Mk2 and Mk3 x2). The R559 will have enough reach on the front. Don't know about the back. Fixed gear and duomatic (coaster brake) on two of mine. I've read of others who have changed brakes having issues with the rear brake fouling the rear suspension block, however I do not know the details as I've adopted different solutions (fixed etc).
Belt drive is a really interesting idea. I have noted that when seated the move in suspension will create more tension. Also as the suspension moves over rough ground (poor pedaling style etc) it will affect and change tension. It has not proved a problem on my fixed gear Mk3 however I understand that belt drives need rather precise tensioning.
Definitely worth changing the rims from the steel originals to modern aluminium. Much lighter and way better stopping power in the wet. The Sun rims on SJS are a pig to get tyres on and off and I would avoid them (seriously avoid the Sun rims). Brompton rims are good and can be picked up a decent price.