Hi Zoltan
I can send you the Sketchup file for the NEMA 17 motor mount. I would be wary of moving the motors to the top though. The last thing you want on a delta is weight at the top causing he frame to flex. Even with just the top vertices and bearing idlers there is flex using 2020 extrusion. I would stick with bottom mounted motors and modify the bottom mount to suit the bigger motors. If you didn't have them spare I would also suggest that NEMA 23s are overkill for his application :).
Andy
I can send you the Sketchup file for the NEMA 17 motor mount. I would be wary of moving the motors to the top though. The last thing you want on a delta is weight at the top causing he frame to flex. Even with just the top vertices and bearing idlers there is flex using 2020 extrusion. I would stick with bottom mounted motors and modify the bottom mount to suit the bigger motors. If you didn't have them spare I would also suggest that NEMA 23s are overkill for his application :).
Andy