Any horse can do eventing at any level.. that is with the proper training and a CONFIDENT rider.
This horse is built a lot like mine, who competes BN but jumps 3'3 with ease. Both this horse and my horse are kind of downhill, but front shoes and a good farrier can fix that problem for you. Also, drafts make great eventers! My horse is a paint/percheron/tb cross, with a splash of friesian (making her super flashy in the dressage ring). A lot of people are bringing draft crosses into eventing because of there mellow temperment, which makes them reliable cross country! So, if you have the money, and you're VERY interested, I say do it.. it can't hurt!
One thing though.. Be prepared for a heavy headset. Drafts and draft crosses have some of the strongest necks, and without the right bit they will tear your arms out of your sockets. This is my problem right now lol
Here's a picture of my lady moving 429985_436499629790503_1141434594_n.jpg