Blazer Bed Floor Replacement

[Chad22873]

So I finished cutting out the bed floor today. Jaros asked for pics so I took a few today and have some of my rocker work from a few weeks ago but they are on my phone and I will post them later. The PO worked hard on this truck to cover up all the rust he could. I found that half the floor was rusted out and fiberglassed over. If you look you can see a silver vinyl strip that runs along the bottom of the body panels. Guess what it was covering? The bumpers that he put on this thing were gigantic. Took me 4 hours to get them off. As you can see from these bed pics the inner flanges are toast. The only cross sill that's any good is the one I left and it's just ok. My question for you guys is do you think I can pull it out without adding any temporary support? I am going to try to put a new floor in and not take the sides off. This blazer is a 70, was built in St Louis, was originally yellow and has a 4 spd manual. The motor you see is the only thing that's not original. It's a 327. Thought I would mention all that considering this is my first time to post pics.