I explain my case... Before I represented any vehicle that I liked and I spent a lot of time thinking and building mechanisms but eventually the opposite happens to me and is very annoying... Now I spend more time selecting which to build that building it. The question is this, have you some method of selection to make your MOCs?, what are your preferences?, must have many functions or just to like?. I think there are many questions about this topic, if you think of another put it here too I would like to know. Sariel has a good method in my opinion, he makes a MOC´s plan and he builts them.