You're looking at 100,000 euro up front before you get anywhere. Somewhere like this site is too small for such a venture. If there was a combined effort between ourselves, retailers and the model railway clubs around the country that may change but unlikely I would think sadly.
Another business model to look at is the likes of what Rapido Trains have done for small interest Canadian models; namely invite pre-orders and deposits and a deadline set say 1 year away. Receive enough pre-orders and deposits and you can then go to the production stage as the demand is there. If you don't reach the target then the product is clearly not in demand. This is a flawed system too as people will want to see the model before they buy etc. You would also need a trustworthy company to invite the orders (best bet, someone like Murphy Models) and the deposit payers to follow through with their orders.
Can't see either happening to be honest.