I tried them (without windows ect ) and noticed no body roll/flex ... I was just test fitting though ...There really isn't that much rigidity due to the fact it's two point in the front and only nader pin in the rear

I'm working on protection from side impact ...Down to roll cage or reinstalling the side impact bars

im drawing up a custom dash that keeps the same concept of the oiginal but without the passanger side. it will take a little time and im hoping it will look good.

i cant find it if you can send a link

I took my back seat out tonight in the rain (didn't get but a few drops on it). I weighed the parts separately and it added up to 32.5 lbs, minus the belts, bolts, & floor mats.  All together I'm guessing about 35 lbs approx.  Cut out the A/C and I got that much more, along with my FG fenders & hood.