The gate platform will support the gate and rollers.
1: Cut 2x 12" and 2x 6" lengths of T-slot aluminum. This is the top of the gate platform. You will also need to cut 4x 5.25" lengths for the legs. Tap both ends of each piece with the 1/4-20 tap.
2: Attach the panel holders, 2 per long side and 1 per short side of the platform as shown (you'll see I was missing two on one side but the parts list has been updated and you should have all 6). Do not tighten all the way.
3. Attach the pieces of 80-20 using the 3-way connectors.
4. Cut the acrylic platform using this file and attach it to the platform holders and tighten everything down.
5. Cut 4x 4" lengths of the 1/4-20 threaded rod and assemble the posts in the holes as shown. There should be one 1/4-20 nut and 1/4-20 washer on the bottom side of the acrylic. On top, lay a washer, 4x 1/4-20 nuts, another 1/4-20 washer and add a bearing shim on top. The order and number of these nuts and washers can be adjusted later to align the rollers with the height of the film as it comes off of the reels.