I can relate some. I had a trail beast built last year with all the best parts. I never planned on selling it and it was for the trail so I didn't do body work. However, underneath was new and rebuilt parts and under the hood it was packed with new parts. An opportunity came along for me to move so I put it up for sale and it was a tough sale. I took a kicking in the pants but did find the right buyer.
-What you have is a trail Bronco so right off the bat it's worth less even though you've done a ton of work to it.
-I6 isn't helping although personally I think it's cool.
-No top, doors, or windshield? Hmm...
-Tough market
-It's on CL. The place where you get 6 spam messages a day and 2 real ones who want to low ball you because they are broke.
-Try Ebay next and be willing to help ship.
If you changed a few things and went the beach cruiser route, posted it in the right location, it would sell pretty quick I bet.