depends on how much capital you're interested in. Basically what you want to do is use the mining rig as collateral for a loan. You can create a security for such a thing on GLBSE, but GLBSE is adjusting their policies right now. But as long as you can provide proper identification and clear terms for payment (and what happens when you don't pay) you should be fine. It may be a bit expensive to do microloans on GLBSE. The setup fee is 8-15 BTC. But maybe Nefario may be interested in setup up a category for this kind of security with lower fees?

Please dont list on glbse to finance your debts.