IMHO - the most important thing is what kind of modeling is making you happy ? If you like exact and historicaly accurate models, than you have to be rivet-counter (though I think, you will never be 100% exact in making models of the real thing). I like to be close to reality, but don't care so much about details - doesn't matter to me how many milimeters the model is shorter or longer, when the general look is OK. Aleksander