Borrowed zipp 303 wheelset from one of my friends to take this picture. There are still some clearance between frame and rear wheel, so I think I can use up to ~42c tires without problem.
Used FMF BMX brakes for 26" to 700c conversion, and Speen's toppull converter to use road front derailleurs for toppull cabling. I also machined 2.2mm thick aluminium spacer to fit rear wheelset to MTB frame.
Current weight is 8.38kg or 18.5lbs. I can shave ~200g by switching to carbon steerered MTB fork (Ritchey / Trigon makes one) and further by switching to 700c carbon fork, so it is theoretically possible to build a 7.7kg folding road bike if you really need one. But I won't go that far..