LOL, so I've never used e-bay... not really sure how to see that item
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But the first thing you need to find out before drilling is whether or not the tanks glass is tempered. If it is, drilling is *not* an option it'll just shatter. A quick e-mail to the manufacturer will clear that up definitively.
Second is to decide what size bulkheads you want. They will determine your lay out and hole size. Find the Bulkheads first! There doesn't appear to be a true standard... and it would suck to drill a "standard" hole for 1" bulkheads and then only be able to find ones larger in your area. These are some sizes for my area
0.5" BH = 1.125" hole;
0.75" BH = 1.5" hole;
1" BH = 1.75" hole;
1.5" BH = 2.375" hole.
Then again, I actually have a 0.5" BH that needs a 2.25" hole...
Third thing is to decide where to put the holes. I was tought at least 4" edge of hole to any tank edge (4" of "meat") but I have seen lots of people do it closer... I wouldn't risk it though. Not for any specific reason, it just doesn't sit well with me.
And fourth is the tool/supply list.
Diamond hole saw
Variable speed hand drill
Combination square (tri square is another name I've heard them called)
Sharpie
plumbers putty or the likes. (something to make a dam for the water around the hole while drilling)
Water source. I'd suggest a helper and a hose... some people use a jug and just pour it on.
some cardboard to catch the plug when it falls out. I just don't like hitting the glass on the other side is all
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So here's a link that has a video, it's on the nav bar for their site.
Glass-Holes.com dope aquarium stuff : Home
MAKE SURE the glass isn't tempered! I can't stress that enough. It's a no- go if it is...
I also just want to say there is ALWAYS a risk the tank will crack. And I have no control over how you actually do it so yeah, normal DIY disclaimer... proceed at your own risk. Just be steady and move slow very little good ever comes from rushing, quality comes from taking your time. Also read as much as you can first, there are LOTS of You-tube vid's you can study as well. ALWAY keep in mind the weight of the drill is doing the work, don't push!
Chris