Rod1949,
Don't let me or anyone else talk you out of it if you are really keen to do this thing, and put in a big effort.
I am a registered builder (some would say architect and contractor) but don't work as a builder. All my houses therefore have technically been "owner built", the last two with a carpenter/foreman - supervisor.
You need to be there. You cannot rely on others to do the right thing...they won't. You need to co-ordinate. You need to order things and follow up.
Will you save money?? Probably not, depending on how well organised you are, except for the work you do yourself, depending on what the current work climate is in your town. You may pick up a few dollars, but remember that if you don't supervise correctly you will be the one coming back to fix the leak in four years time.
In my experience subbies will be thinking that this is a one off, they will have a lot of buggery factor because they are working for an owner builder, and will charge accordingly. You won't get the same rate as they will give a builder for whom they do regular work.
You may be able to buy some things well, but remember that saving twenty or thirty dollars on a toilet pan isn't a big percentage of a couple of hundred thousand :eek: .
So... enjoy it, put your heart into it and get a great deal of satisfaction at the end, but don't do it to save money.
Cheers,
P