No worries with the "extremus" thing .... that's actually a custom title: you can set it yourself in your profile but you may need to have a certain number of posts to your name before you can change it.
Unfortunately, laptops are usually very difficult to service and modify. The usual spots for generating heat are the CPU and the GPU.
There won't be a lot you can salvage I'm afraid: the processors are different on laptops to what they are on desktops and could even be bespoke to that particular motherboard. it seems sad to have to throw away a perfectly good CPU if the mobo is dead, but by the time you get to replacing the mobo, it often works out cheaper to replace the whole unit. Same with memory: laptop memory is incompatible with desktop memory.
If you do salvage anything, definitely keep the hard drive and use it for backups. Also, the CD/DVD drive may be worth keeping if you have anything else you can put it into (although it looks like a bespoke design - you may be able to get a caddy for it).
The choice is yours: you could take it to a repair shop and get them to assess how much it would cost to repair, but there may be a cost implication to this.
Or replace it.
As Bob said, if it's overheating and the cooling system is not at fault, then I wouldn't trust it any longer.