Ok, I've seen this dash on the bay, and its fairly cheap, £35 buy it now:

I know it will need a lot of trial and error to fit, but does anyone have any advice for doing this? I don't want it to have any rattles or anything like that, I will be fitting in a carPC so the centre will be used for a touchscreen.
The things I'm not too sure about are:
- Fusebox, would this need to be replaced, or can I use the existing one in the mk2
- Supports, I have heard you have to use a crossmember from a mk3 for a mk3 dash conversion, but would this apply for a mk4 dash conversion?
- Heater, I want to change to a more reliable heater, would a mk4's heater fit, and what should I use for the heat ducting to the vents?
This is probably a question for the Dizzie one, but might be useful for others to see if they are thinking about doing a dash swap...