Hi dave,
Im use to building large "boys toys" as I use to be a boat builder but I think anybody can acheived anything all within a reasonable price, I mean why does one have to go and buy a brand new motor for a modeller when they are plenty of alternatives out there and half the price and no doubt free if one just looks a little harder.
Another example large scale model body work, does it have to be made from steel or brass? NO just use glassfibre its such a great material to work from and anybody with a little commonsense can preform wonders with it, belive me I have.
All the best
Chris