And the nice thing about the heloc is you won't be paying interest on the money if you're not using it. 

I would also add that investors are often interested in Blanket loans because they mistakenly think it will save significant closing costs, but they do not as you will still need four title polices and appraisals etc. and you will get far worse financing terms on the loan and have a lot less flexibility down the road to refi and sell properties.  

I have been working with a realtor in the past (when I bought my first property) who does not seem interested in this type of sale.

I've seen some simple templates circulating the internet and this is nothing alike.

Please tell me about your experience.Though I have experience in other areas of RE, this would be my first sub-to deal.   

I find this vague.

They're like bank & credit union loans... but with (i) more leverage, (ii) more interest only, (iii) [typically] lower rates, (iv) non-recourse structure, and (v) no deposit requirements / no requirement to start "a relationship". 

Question, if you have loan, interest bearing only, the loan has the Contruction loan that has not been paid out yet.

Would you see yourself using a tool like this, or is it just another shiny object that’ll collect digital dust?

Any other strategies for using 1031 money in this situation or is it only for purchase of a new rental property?