Buy the blazer for as little as you can.........and instead of getting a loan to have the body work done, invest in a welder and other tools and either learn to do the work yourself, or get help from here and friends around home. Do you have any interest in doing your own work? If so, there are plenty of (artists) slaves here that would be willing to help
A lot of owners like learning and working on their own trucks....some don't want to or care to so they pay someone else to do the work. And it doesn't matter who does the work as long as you're happy with the results.
You've been given tons of advice and now you need to decide if this is the truck for you or should you keep searching?
willie