Is it possible for me to get financing for other properties if I've never worked a real job (or by using my house as collateral?) 

Your cash flow is typically the only collateral they'll loan against unless you're a coop since the units are owned in fee simple, hence why the reserve amount and delinquency rate matter.  

If either of these methods work, then I should be able to stabilize the property by early 2016 and refinance through a credit union or bank using the property itself as collateral.

The Gap lender's rates are typically a little higher than the lender in 1st position.Another option is to work with a lender that allows the down payment/skin in the game to come from other sources such as Seller Carry Back or Cross Collateral.

Are any lenders in Denver/Boulder doing long term loans these days collateralized with liquid assets?

A certified audit might be important, but not sure how you'd get the board to agree to pay for it if they are already asking you to put personal assets up for collateral on repairs, which I agree is insane.       

Even if your employer does allow for an in-service rollover to another plan, you would need to retain $20K collateral for the loan in the plan, so you would only be able to move $38K.

Dude, i do not know if this is also the case in your state but, here in the Philippines, banks are looking for a clear titled COLLATERAL on the application of refinancing.

While some manufactured homes are attached to real estate by means of a permanent foundation, many more are not1 , and the collateral with which to secure the loan is limited to a title lien in the same way motorized vehicle loans are secured.

If it's the lender down payment requirement I would show the improvements to their collateral I was going to do.