Hi Migs, there's no issue with dremelling the lugs out of the chassis, I know at least one person who has done it to accomodate a fat lipo (only to discover that changing to the TA05 battery brace would have solved the problem!) Whether it will give you a noticable improvement I don't know sorry.
I'm also unable to comment on the TA05 diffs, they should fit fine but as I run 6.5 I just wanted the durability of the TRF501/511 outdrives, same for the layshaft as I would always run a slipper.
And finally, I've never had cooling problems and have never cut any vents out but that's mainly to stop the rain and mud getting in! I have a standard DB01 chassis and motor mount, so no extra cooling from them either.
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