Stewart,  If I go get a home mortgage, the bank can tell me within 5 minutes how much I will be paying in interest charges over the life of the loan.

The HART funding mechanism is not new or untried.  Any accountant or economist should be able to tally up the construction cost, the loans necessary to bridge the timing delay on the delivery of the tax money, and the interest cost of that loan.  The only estimate will be what the interest rate(s) on those loans would be.  Run one scenario at 10% to be the pessimistic estimate and another at 3% to be the optimistic estimate.  Reality is somewhere between the upper and lower bound.  This effort must include the interest cost because that is what is coming out of our pockets.

If the state government won't do it, I am sure that a UH professor will be happy to do it for us.