thanks for your comments... here's the final update before I post the Completed thread.
I scratch built a roll cage using all sort of bits from the spares box, it seems to fit ok and certainly makes it looks a lot more racecar rather than road car now... a bad omission by MR Tamiya tut, tut!
on the interior, I added some extra details on the fusebox rather than the printed flat fuses, I also added a few more electrical wires and more switches to the centre tunnel.
I also added the remaining bits to the engine bay, the two black air boxes and the radiators, I detailed these with some RB Motion hose ends...
So that's it, I will now put it all together and get some completed images up, thanks to one and all for you kind words and for following along.
Next up a Brabham BT34 from the good ol 70s