Originally Posted by Mercedes
If your talking training level and lower eventing, ride a camel for all it matters. If your talking Prelim and up...probably not going to work. The cross will have a too high ratio of the bulky fast twitch muscles and won't have the speed and stamina to make the CC times.
I am sorry, you may mean well, but you seem to have a lot of very negative comments all over the forums, I think you could have come up with a nicer way to get your message out there.
At the OP: There are some very talented draft crosses out there, not all of them are going to be bulky monsters. Check out the eventing percheron blog if you want to see a pure bred percheron doing well at eventing even.
Some pictures of your possible purchase may help us help you a little more too. If he is well-trained and seems like a sweet horse, then I would go for it anyway, if you out grow him in a couple of years at least you got the experience with a good calm horse and can move to something bigger and better later.