Interesting that you know I'm left handed, just from that one post, intriguing.
I must say the frame seems to fit alright, I see you have the first two bolts in ready, Just three more to go.
A way to resolve the rotation of the frame is to sleeve and pin the upper frame rails together and then remove the 10mm from the legs accounting for the slight realignment of the front frame mounts, which may mean you gain a mm or two up top but you've only pinned them and they can be repined before welding and setting in position. That way the three rear bolts will slip right into the three mounts as yet lined up.
You can continue the way you are going with some attention paid to the rear wheels movement into the frame crossmembers.
The addition of 37mm by using the K1100 paralever nearly lines it all back up again in the 1100 frame just 41mm to sort.
Moving the engine forward to the front frame mounts and dragging the gearbox forward will change the stock footpeg setup, It would be close to a mid mount of forward controls like some choppers offer. Interesting concept.
I don't know anything about the KTM front end you are looking at but am wondering does the front guard look like touching the engine on full compression?
I like the idea of a K1200 gearbox and suspension in there, but thought it might work better with an R850rt gearbox and suspension, that would also give a closer final ratio for the road. The travel is 135mm for the R850 and that would match the front of a stock K1100 but maybe not the KTM or DUKE front end planned.
I at present have the K100 final drive on my K75, and it does not hurt the bikes drive out of corners of tootling around town. Just a thought.
Looking forwards to your next post. Interesting that the K1200 and R1100/850's have 120mm front end travel which is an equal to the stock K1100 rear in there at present. I am wondering just how a matched set of suspension travel would do to the bikes feel on the road.