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Great choice, I've got one too. You can take a look at my build thread here as it shows what electrics I used: https://www.rc10talk.com/viewtopic.php?f=28&t=43284&start=15 There isn't a huge amount of space in CAT to get the electrics in neatly, a low profile servo will help, you'll need a 2...

I just checked, I have a 23T pinion on there at the mo with the spur that came with the pro transmission. It's been a while but I think I got the transmission ratio from either the main manual or the pro trans manual and fitted a suitable pinion.