glad to see its all done , the summit wheel /tires aren't beadlocks ,that ring just screws to the wheel to give it a beadlock look.
I would maybe look at some proline wheel and tire combos , I run trencher x's on my bb maxx and they hold up great.
you could cut and shut a plastic driveshaft for the centre rear but for the front you may need to get a kit with a cup and dogbone bitd flm used to do it which would allow you to use a 4907 spec disc but you would have to do some hunting to find one these days I think
you may have to trim the pilot shaft down a bit but it depends on how much you cut off yours , get the clutch kit and try ,you will have to probably use a screw in the end of the crank to retain the bell instead of the traxxas style c clip
most chassis kit come with matching braces , just check that they are included if buying 2nd hand ones.
gpm has some decent gear I haven't used their shocks but they alu hop up gear is sweet .
as mentioned before it will be a lot of trial and error ,a while back I built a bb maxx for my brother...
do you have a big block chassis? it aint gonna fit without it or atleast a monoblock extension. easiest clutch kit to use would be a savage one but you will have to change the spur to a revo spec to get the correct pitch.
you may get it to work but its going to have to be converted to a 4 shock...