Will this hold my 63 pound black beauty??!!

If you buy it, lose the casters. 

Something that works for me is stone....(No, not ’stoned’...Stop it. *L*)

You can either replace the glass, or set the amp upon it under the rack if that will work in your situation.

As for the stone itself; get thee done to the nearest (or cheapest) firm that does countertops. They always have ’drops’ from cutting tops to fit sinks, or generally ’leftovers’ of various types, patterns, colors....

We used to have a shop next door that did (and still does, they moved to their ’purpose-built’ shop) and had ’leftovers’ by the pallet load....

...and would throw them away. Too small to be useful....*shrug*

Squared edges, polished...or as fancy as you like. *G*

If that’ll boat your float....;) (Works nice with turntables, too....)

(...now, if it was a 64 lb. Class D amp, I recommend .5" plate steel instead.....can’t be too careful....)

"....50 thousand watts of Funky!".....;)  Voice coils like bazooka shells....

I would be afraid to buy based on pictures. What if it doesn't turn out to be as ugly in real life? Then what?

Also I'm not too sure about those wheels. And the glass. Other than that.... you could probably throw the glass away, fill the whole thing with sand, get a few cutting boards, and some BDR Cones, and with just an extra hundred bucks or so have a pretty decent rack. 

I know they would up here, not sure about down under. No, really, I have two Primaluna Dialogue 7 monoblock's that do fine on tempered glass.