Hi Woyta94, great 3D model! It's a very good match to the Master Replicas version of the helmet.
I was able to measure the Master Replicas helmet and got these measurements:
Width at the tips of the ear cap detail: 26.8cm
Width at the lower widest part of the helmet: 27.5cm
Black brow width...
Looks good, thanks for sharing your progress! I can't tell from the screencaps in Episode 8 - is the stitching on the DW flight suit bright like the Mando's or is it dark?
Try the forums at The Custom Saber Shop - http://forums.thecustomsabershop.com/forumdisplay.php?15-MR-and-Hasbro-Single-LED-conversions
They have plenty of tutorials and I was able to use one for my MR Luke ROTJ saber successfully. Good luck!