No chassis distortion at all from the fully welded floor. I have to admit i did use quite thick sheet 2mm! so 12 gauge lol.
You can see a slight bit of flex on the center of each section but that's because i put a big weight in the center when i welded the cross bars as wanted to make sure the sheet was flush. I know a couple of the cross bars for the seats are not quite level with the chassis.
I started on the big end and did 1 inch weld then 2 inch gap from the center of the back then alternated sides each weld working towards the front. Making sure the temp was even and did not stop until the end. Waited for it to cool then welded the cross bars with 3 welds on each side. Waited for it to cool again then filled all the gaps with the same method. Tomorrow i will do the same with the inside but will not infill.
As you can see from these pics there is no warping from the first welds. Some people say that 2mm is uber thick but to be honest i wanted the floor to be the same as the box section wall. It also allows you to put a lot more heat into it. It does add quite a lot of weight but then again i have the engine to move it and lets face it the cage and chassis stretch all ready added a bit!
As you can see the cross bars caused some warping but that's because i put two large packs of tiles in the center of each section to make sure the sheet was flush with the rails. But to be honest its not like it really matters as you cant tell from the inside and not many people see the underside unless they are very very unlucky!
