Ok, now that I got your attention with that topic, let me explain!

I've had a SID for nearly two years that I've been having video trouble with. Fixing it is beyond my capabilities. I even got a replacement monitor to no avail. For all I know, it could be a board probelm or a power problem. I just don't know enough about that stuff to trouble shoot. However, the thing is in nearly perfect cosmetic condition except for the front glass, and I'd really like to see it working.
So I think I'm going to replace the guts with a MAME setup. It'll continue to play SID and original Space Invaders, but I'll probably set it up to play other 2-way vertical one button games like Galaga and Galaxian. From the outside, nothing will change.
What do you all think? Practical or sacriledge?