Like I suggested Amish - if in your area - or boat cover maker. Would have materials and tools and knowledge. Only issue may be framework, but you may be able to source that from someone who has that from a complete soft top but has no fabric.
OR, buy a complete soft top (used?) and have it shortened/modified to adapt to the half cab top.
This may be the easiest, as possibly all necessary 'parts' would be there.
Good luck.
Thought this thread had drifted away from your initial request and tried to steer it back!