Made one myself for my fish pond some years back just used a normal pain of glass but used the wrong pipe I used 40 mm waste pipe believe or not the pipe melted.
I had my D2 remapped I think it was about £160 well worth the money. Don`t buy them chips of ebay get it remapped you want be sorry as it makes a big difference and if you put premium fuel in it`s even better.
Got a 2003 one, Had 300tdi before that but the the td5 is a lot better had it 2 years now, Have a good look at the underneath for rust changed window lift and injector harness and sealed sunroof but they all leak anyway.