I've built a HTPC using the mcubed unit on that page before. It is very heavy as you say and the heatsinks on the sides are very sharp (they have serrated edges). It's very easy to leave loads of skin on it.
I wasn't impressed with the quality for the price and is a fiddly build (you need some very long screwdrivers for example). The PSU only sits in the middle and is obviously designed with using a fanless one. The IR receiver is an Imon one (unless they've changed things).
If you're going the whole fanless route you do need to be very careful, heat is still generated and you really need some way to shift it.
It comes with a scart connection although this is only compatible with a very limited number of graphics cards.
You also have to fit a floppy drive (in the rear) or you have a gap there.
I think you can do better that this case.