Congrats, looks in very condition !!
You jump a bit too quick to the conclusion that it's the PCB. Do all the basic work first. Check fuses, power levels, monitor function etc.
If there's really an exploded cap I'd love to see a picture of that.
For a tinted plexi, look for a local perspex dealer. With the correct sizes they'll be able to sell you a perfect match for around €15, at least that's what I paid at my local dealer. Don't go too dark though, you'll have to "overdrive" your monitor if you choose too dark plexi.