I'v done every sort of model since I started last century
from milarlty , aircraft , ships, cars ,and bike and I think the 1/12 range of gp bikes are the most challenging because of what can be added to them .
It is good to try / do a different sort of model now and again so that your interest will not waned
techniques learnt in one sort can be added to another making your models even better.Have
found doing ie aircraft some rivet counters get a bit carried away like there may be 1 rivet not added or 1 to many added and they run you down and rubbish the model.
Don't worry about that any more if it looks good to me , although I will try my best to get everything right have to keep asking how just do you get plastic to look and feel like metal.
Shayne