My brother and I share a track day car and it has worked really well. Apart from consumables, we share ALL costs 50:50 and it has not been a problem. We have a monthly spreadsheet that spells out our 'investment' into the car and what we both owe!
For me if fractional ownership is the way to go to realise your dream, why not? Just make sure you're both clear on the rules and then I'd go for it David, but do keep us all in the loop!
Good luck
Brian
