Hey there,
let me state immediately that i've never built a Tamiya Truck before (in fact, no Tamiya what so ever), and i've ordered nothing just yet, so if one of the questions should be obvious if i had a kit in front of me, i apologise - i don't, yet.
Lets start with my shopping list, currently.
It's going to be a Scania R620 6x4 (reason being that i want a three axle truck, and that appears to be the cheapest by some margin) kit, with a FrSky X20 radio (haven't figured out the receiver just yet), a GT Power 60A Truck EU Sound Light and all the things unit and paints (more on that in a second). I do have random standard sized servos lying around taken from various other RCs (around 15-20kg Servos, standard servos taken from RTR crawlers etc), i assume these would work?
Well, that's about it so far. Paint, i decided on aerosols by Kustom Canz, automotive paint. I settled on a base coat and a colour (silver medium, candy ruby red) as well as a 2k clear coat - that's about it. Does the body need priming? It's my first hard body that i intend to paint reasonably well (it's not going to be perfect, i don't need it to be perfect - but i do need the paint to stick), just to point that out. What other colours do i need at the very least? I assume some kind of black (for the interior, if that isn't already black?), something maybe for the grille?
I don't know anything about clear coating either, other than 2k clear coat apparently being rather toxic - i do need to read into the process, buffing and sanding etc - no idea. Mainly, the question is, so far in this list, is there stuff missing? I also wrote up Tac Cloth (never used that before either), but that where it stops. Any input appreciated.