The rear barn door upper removes with a couple of bolts. The bracket Gr8Tops uses to attach the barn door upper to the tailgate is different than the one on my Jeep, but it's functionally the same.
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As I designed the Safari Cab, the end panels are separate from the side panels so the side panels come off easily and the roof is still supported by the rear panels, this is a photo of mine:
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The sides are removable on the Gr8Tops version too, but Gr8Tops decided to mold the sides and rear corners as one piece, so the back corners come off at the same time as the sides. Because the back corners are part of the sides and therefore come off when you remove the sides, you'll need to have supports for the rear of the roof panel. This photo is of my Safari Cab with the sides, rear corners and the barn door upper removed, you can see the supports at the back for the roof:
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I designed these supports and arranged for having them manufactured but Gr8Tops decided not to put them into production. A few years ago I arranged a short production run as a favor for several Safari Cab owners, but other than those few they were never made available. The "production" ones look like this:
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I had also arranged the manufacturing of roll-up soft sides for the Gr8Tops version of the hardtop. The soft sides for the Gr8Tops version replace both sides and the back. This photo was taken at the sewing company that made the preproduction soft sides:
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The "Gr8Tops style" soft sides rolled up:
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Unfortunately Gr8Tops decided not to put the soft sides into production either.
So I'm afraid the Gr8Tops version of the Safari Cab is really only intended to be run completely assembled, with the sides and rear corners in place.
But:
1. If you want to run the Gr8Tops version without the one-piece side/rear corners, making rear supports isn't too difficult. I can show you a simple proof-of-concept set I made before I designed the "production" ones shown above.
2. If you want the "Gr8Tops style" soft sides, they can be homemade if you're handy with a sewing machine.
3. If you want just the side panels to be removable while the rear corners remain in place, it's not too difficult to cut the one-piece sides/ends apart and add bolt flanges to each side of the cut line so the resulting two parts can be bolted back together but also allow the corners to remain in place when the sides are off, thus eliminating the need for separate roof supports. Just requires a little fiberglass work, I can show you how it can be done.
4. And if you do #3 above, the soft sides to replace just the side panels are much easier to sew because they're pretty simple flat panels and you don't have to worry about the soft sides going around the corners in the back.
I'm happy to help with more details on any of the above or with any other questions you might have.