I'm with Watermelons - you'll find out soon enough. Depending on the breed and on your bunny's character the pen might or might not suffice to contain him. My youngest rabbit is an escape artist - I swear he jumps higher than 1m without any run up whatsoever and he climbs to. But he's the "worst" I've ever had in that regard (and I'll admit it, I'm dead proud of his skills even if it's inconvenient ^^).
Same goes with the 'eating the pen' part of it. Some rabbits will chew on everything, others will not. My rabbits live in a room, they have a cage which stays open where I put the food, water and litterbox. The plastic tray got chewed a bit, but they never took like a real bite out of it. The bars of your pen look pretty thick so I think it's doubtful he will be able to swallow part of it. If he only chews it a bit, it's nothing to worry about (and if he does begin to chew it obsessively enough to broke the bars of, it means he needs more time out of it - a tired / non frustrated rabbit is a lot less likely to chew the bars of his cage / pen).