Just be prepared and build contingency into your timeline and budget.A couple of notes on the specific question: Construction loans are riskier for banks (no finished home as collateral) so hard to find info.  

Remember 2 things about Helocs: 1) they are backed/secured by real property unlike a credit card, ie there is collateral for the loan 2) when you have a credit card with any size limit but a $0 balance and a bank is underwriting you it is not counted against your DTI because you do not currently have a balance and thus no current monthly payment.

Whether they’ve had previous issues with these companies with regards to getting collateral materials or resolving problems, the general consensus has been, most buyers feel they’re between a rock and a hard place.On the other hand, the loans that are available for bidding have been sold at astronomical numbers.

Just put realese clauses and substitution of collateral in the agreement.

The investor yields on those programs vary from 7% to 15% depending on the loan parameters, the experience of the lender, the collateral, and the investment platform.  

Returns, cash flow, down payment or collateral, passive/active investor, long term or flip, sweat equity or not, etc. 

I'll make interest or take the asset serving as collateral. 

Texans can establish lines of credit using up to 50 percent of the value of their homes as collateral (as opposed to the 80 percent allowed on standard loans)."

Only it's collateralized by Real Estate.You have no control.

To the contrary, the borrower has such a duty to preserve the security used as collateral, in this case, a house.