Heres my go at a Crossfire Brawl using PCC Heavytread.
Here is the movement i can get with adding a energon port to Heavytread from the energon tank that came with the original Bruticus. With the modification I have made it can only move to a certain point and no further to hopefully give it a bit more stability in the knee joit.
Here are some before and after shots as you can I have taken the screw that holds the port together. I have then glued the black part that has the ratcheting system on the modded port and sanded down the sides so that it fits inbetween Heavytreads legs.
I have also drilled the centre holes bigger so that they fit onto the pegs found on Heavytreads Legs. I also cut a half circle into the sanded down sides so that i fits onto the peg and between the pin that holds the knee joint together.
So that now the half circle will move around on the peg until it hits the pin on the knee joint.
How the port fits in tank mode sadly there is no spot for it in robot mode.
One minor problem is that Heavytread sits back a little bit which doesnt allow his turret to point up like its G1 counterpart but can easily be moved to fit on with no worries and still look good in Bruticus mode.
I hope that all makes sense he will eventually get a paintjob and modified to hide the other PCC ports