After lots of looking around at different styles and theories I decided to get a MULLER vent to put on the roof.
Slim line jobbie.
Hopefully this will help keep the cab temp down a bit, got back to the car after the beach and it was like driving home in a sauna.
Will post up pics when its painted and fitted.
Worst case scenario is a screw the hardtop and need to get a new one, I will be doing lots of measuring and minimal amounts of cutting.
I use to do this sort of fab work for a living 1 million years ago, surely I haven't lost all my hacking stuff up skills.
Fingers crossed.
In relation to my servicing kit, I got Gates timing belt, all runners, gaskets, seals, jap water pump and cam cover gasket for $200 delivered from MX5 PLUS in Queensland, $100 cheaper than pick up in Sydney, LOL.