You like your purple and pink don't you Dave
you must have an awful lot of patient to mask something like that, do you use liquid mask or tape? I'm looking out for some A4 sheets of masking tape, would make stuff like that much easier but not many places sell it.
Chckboy to build the cuda in standard form you need a 2.5mm hex head driver for all the upper deck screws, the big cap head ones.
A 1.5mm hex head driver for things like cvd grub screws and pinions.
Philips No. 2 screw driver for all the other screws, mostly countersunk ones on the bottom of the chassis.
You'll also want a flat bladed screw driver for the diff screw, just something of average size.
Lots of people here don't like philips head screws, me included, as it's very easy to strip the heads, leaving you with a big problem of a screw stuck in your chassis. So most people get a screw set that has a 2mm hexhead to it. You can start with just the philips head screws to save money, they are all counter sunk head (cap heads sit pround of the surface like the ones used on the top deck) Alex Racing also makes a complete set with Torx heads which some people like others don't, I've never used them so can't comment, but they should be a lot better than philips head.
Hudy make good drivers, 120mm helps youo get into difficult places, I never find a need for shorter ones. Integy drivers are good IMO, certainly the 2.5mm one I have is nice, nice large handle and has a good fit in the screw heads, it's the smaller hex;s you often run into trouble with though as they are easier to round off, so I don't know about them.