Thats correct crusty, you could do that. But any scaling up to accept a gasser increases the weight, which needs bigger servos, larger batteries, perhaps a powerbaord, more thorough checks and all in all deserves a lot more care. You are right, no need for dramatics at all, but the heavier gas powered models (even a giant stick with a direct bolt on weed whacker) have a lot more potential for dissaster. A few years ago we had a large 32 lb. model fly away while the modeller was standing just outside pit area adjusting an on-board camera at full throttle. Somehow the battery pack came loose and pulled out the connector, he panicked and wiggled the sticks while the model ran across the runway full throttle, got airborne in less distance than we had ever seen it do before, shot skyward, did a nice wingover before being smashed to smitherines on the pavement along the runway.
It was a sobering lesson for all of us.
I know, this could well have been a 40 sized trainer, and I have seen accidents with trainers as well, but the larger airplane deserves a lillte more respect, a lot more care and considerably more work to make them safe and enjoyable.
my 2 cents.