glad to see your on the way,
" the plates are a hammer to fit " as nessary....the main hoop i weld to the subframe connectors, sometines have to cut a fairly large section of floor out to weld it in . i use a thin cut off wheel ,save the piece and then fit it back around the hoop and weld it back in. the plates can be bolted also , usually the diagonal bars behind the seat are done that way ( from the hoop to the floor ) any place that you can go through the floor and weld to any piece of frame ,, do it.... when the tubesits over the rails it is pretty easy tocut the floor piece and put the plate in its place, weld it underneath to the rail and weld it to the floor pan also.
Lots of fitting and trimming . go slow , it can get you down ...just take a break ,have a cold one,and back at it.... it use to be ok to weld the plates directly to the floor pan, better check the rules tho.....i also have put in a piece of box tube where the front upright bars go to the floor ...weld it in place between the rocker and the frame, or frame connectors. then weld the upright to the box tubing, the tubing will act just like the torqe boxes,,,, give youself plenty of room to work when you cut out sections of floor to small of a piece taken out and you will end up making a second cut to make it bigger, then you dont have a good piece of floor to put back in.. and will end up making a piece for that. like said before ...take your time ,,, plan it out first , measure twice before you cut....every time !! good luck....
oh yea ,,,,you know how much we all love pictures......