The G29 is worth it. It's amazing with Dirt Rally. Based on your last post, you might enjoy that game. The first one, not Dirt Rally 2 which was a let down. But if that PS2 wheel works, including the force feedback, that's awesome. Nice account name, by the way :)
If you're brave enough to open it, you might be able to fix the overheating issue by getting dust out of the heatsink that hooks up to the GPU. Most laptops have disassembly/assembly instruction videos on YouTube. Another thing you could try without opening it is using MSI Afterburner to underclock and undervolt (a little) the GPU.
I'd love to get the G29 but it's pretty far out of my budget, that's why I went for something cheaper, but I think the PS2 wheel doesn't have force feedback which is a need by what I've been seeing, I may get something different or continue with what I have now which is a Dual Shock 4 that I set up so that the gyroscope does the steering, it's been working but I thought that a wheel would make the experience lot better. Hopefully I can increase my budget and get a G29 from the Hive posts.
About the laptop, I have taken it apart before and found no issues internally, it's clean and in good shape, but it didn't fix the problem, I do like the MSI afterburner idea which I will try but first I'll do some research to make sure I don't mess anything up haha. Thanks for the idea and info on the G29, I hope you have a good week and see you next post. ;)