Looks good. Did the same a few years ago for my Bro. Once thing we didn't do was explore a three-point belt. Check behind the side panel and see if there is a spot to mount the belts. There is on a SWB. I'm pretty sure there us a plug up high above the rear window that hides the spot for the top of the belt. If there is a spot behind the panel, source out belts from a 90 (I think 89 ,too) SWB.

I may end up with a Gen I LWB as I think I need more room over the SWB. If I do, I'll likely use the Gen II 3rd rows in my SWB. I like head rests...

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com