I was going to build one but ended up scoring a nice factory cab from a great member on this site. So I can show you some pics of how that is assembled from when I painted it last year if that would help.
Rear attachment to seat and fender pan.
Back installed on that.
Front frame and window. it just uses a big L bracket from side channel to floorboard bolts.
Roof is just curved sheet metal to connect the front and rear. There are 2 little gutter things over the doors but they're are pretty much just angle iron.
Windshield is hinged at the top so it can swing inward to open the hood.
Some flat stock straps to hold the canvas shape around the hood and away from your feet.
Doors are pretty much the same as a Jeep soft top but hinged at the rear.
Hope this helps with ideas for you.