As usual, its difficult to guess whats needed when it comes to replacing the floor. These are my typical questions for blind quotes.
Has it been fixed before? Is the surrounding areas in excellent shape? Is the rest of the frame ok? Is it the short front floor, or the long front floor? What are the labor rates in your area. Are the body guys fabricators with experience doing this stuff?
If it was in my shop, and I was putting in one of our T-caps, and a simple front floor? I would guess your looking at 8-10 hours labor, plus shop supplies, so your in the $6-900 range here.