Should look nice if you hide everything with a nice flat panel
You'll need slots in it for the harness, obvioulsy, but I have one (along with a few others) and it is a really good bit of kit.
The brace looks good too, although I can't see it being of much structural benefit in a MK5, but as a means of stopping things flying around the boot and looking great, I think it will be ideal.
Be sure to post pics once you've done it.