I doubt there would be enough room for a parachute in a 152. They have the reputation of being a tad intimate. I've never even sat in one but I'm not certain I could shut the door.
Trust me, there's room.

I'm 6'5", and I do aerobatics in an Aerobat, and if we move the seat all the way back and take the seat cushion out, I almost fit. It's little tough to get to the throttle and trim, and it's terribly uncomfortable, but it's worth it.

My friend told me that once he was flying circuits and the door managed to open up, he had to lean a bit to close it again. I wouldnt have wanted to be in his position without a great deal of chute attached ;D
I've had the door on the Aerobat open up on my twice while doing aerobatics. Once when we were a quarter of the way through an aileron roll (to the left), so I was in the left seat (on the "down" side of the airplane), looking out my open door straight to the ground. That's when your glad you tightened those belts down until you could barely breathe.
The second time was in a dive to gain speed right before a roll. Right at the bottom of the dive, we were doing 125 kts, and I braced against the door for the pull into the roll, and when I did, it popped open, so I had to do a nice little 4.5 G pull back up to loose some speed so I could close the door. That was fun too.

I wouldn't have any worries about initial aerobatics in an Aerobat (NOT a regular 152, that will get you killed pretty quick). My instructor is an A&P and he has looked quite a bit at the insides of the Aerobat, and he said they a beefed up pretty substantially.
As far as the parachute goes in the US, if you do aerobatics, you are required to wear one, but there is no formal initial training or currency training. You get a bit of ground instruction on how to get out of the aircraft in case something does happen though.
I've got to get a video one of these times. My instructor and I keep forgetting.
