As far as the project money goes, based on what IGA has said... The kickstarter is 1/10 of the budget. The rest will be provided by an interested party, but only if the kickstarter succeeded.
My presumption is that this third party will not be backing proportionally, so just the 4,500,000. SO that is 5m in total, with the minimum kickstarter funds. Anything beyond that is gravy, so, we're technically at 6,950,227$ for the 'total' game budget right now. This is of course overestimating though.
Kickstarter gets 10%. The production of the rewards probably takes another 30%. This leaves about 1,170,137$ actually going into the development of the project. This totals to 6,170,137$.
But now lets ask, what part is going into development and what part is going into legal, and marketing? This is an extraordinarily tough question to answer. Mainly because it is heavily dependant on the way the project is run and the project itself. Lets say for the sake of argument that it is a 60/40 split, 60 for development and 40 for the legal and marketing. The actual game development fund comes to about 3,702,082$ in this case.
These are of course all estimated values, but gives you a base level insight into how these projects get budgeted and balance out.