Im with Gage56...even used the same floor pans (I thought he stole my pics for a second LOL). I used to fab solar panels that were 40ft x 10ft x 5" and weighed close to 2.5ton. We welded the 3x5 angle iron frame, but the pans we glued in with automobile panel adhesive. We did tests by flipping them upside down and the the glue held up better than I would have thought. We even had a guy come in from 3m and show us a bunch of stuff about their products. This was almost 10 years ago already so I am sure their stuff is even better.
In short there are pros and cons to each...glue them and its easy and no heat, no grinding welds. Weld them, they are permanently bonded together, you know what you have! But if you own a Jeep, I would recommend a welder and learn how to use it. Jeeps should come with welders.
Time and budget build...lots of pics::::
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94 YJ slightly modified
00 WJ stock