The derailleur set up looks original I may go that way I do not know at this stage, I am stoked I had one of these a while ago, but it was too big, now I have this.
As long as the big 4 do not put up too much of a fight (Stem/Headset/BB/Seatpost) we have a pretty solid vice at the shop so I should be OK
Some big hammers and some lumps of 4x2 too, should things get difficult.