hey duke - I think you should wait and move in the housde and see it first hand how much light you get through the glass.
Sidelights are ok as long as you have the space to fit them - if you want double doors with sidelight then you need a very wide entry. If you are thinking sidelights with one door than it's a different story all together.
Re customising your doors - I think it will cost you more than it's worth to have them customised - you will be better paying the variation fee and getting the right door through the builder or have the replaced after handover - you have plenty of choices at Corinthian - have a look at these ones
http://www.corinthiandoors.com.au/Produ ... e&ItemId=1