Location, location, location.
Patience, patience, patience.
(all truisms are true, by definition!, however boring, trite or simple they sound).
Only use money that you really really don't need for at least 2 years.
Be prepared to lose at least what you plan to spend on paint/polyfilla/kitchen. And make sure everyone understands that.
Forget about covering your real/personal labour costs.
Factor in your time-on-project by at least a multiple of two, and then add another 50%, and then think about it again (you need to understand the impact it'll have on your present way of life - like no free evenings until it's finished).
A six people planning/building committee is not a formula for instant decisions or success (IMHO!) - I'd suggest you make individuals responsible for certain areas re decisions etc.
Either budget v v carefully, and stick to it - no exceptions, or double your best estimate and plan resale accordingly.
Plan resale based on original cost plus cost of materials plus a modest profit % (building society savings rate are a clue - say 6%. Anything more is lovely but not to be planned for!!), and absolutely nothing else - a 30k kitchen doesn't mean the house is worth 30k more, ever. Sad but true. A new boiler, double glazing, etc etc, they none of them guarantee added value, all they do is make it easier to sell, possibly. And a lack of them is an invitation to the buyer to negotiate the price down.
Be ready (this is so easy to say, and acknowledge!, but almost unimaginably difficult to do!) to cut your losses and get out v v fast.
Other than that, sounds like an excellent idea!