Check this link out for a run down on them: https://www.blueovaltrucks.com/ford_articles/the-ford-highboy-f-250/
Yes, that's the kit I'm referring to. They have been going up in value, for sure. Depending on how comfortable you are with bodywork, you could start with the AMT 92-96 F-150 kits to get a cab and inner bed structure. You'd need to switch the front clip over from the Bronco as well as transfer the wheel arches from the Bronco to the F-150 bed.