But if I borrow from a specific source, my HELOC, only then I cannot deduct the interest?

Regarding your questions, in my opinion, you should look at your HELOC as one of many funding sources  & for every deal you should analyze which funding source (cash, your HELOC, refinancing one of your other multifamilies,....) is the most effective to use.

In sum, his main source of funding is to have the seller sign over their deed but maintain the financing in their name.

Doing your own sourcing rehab and renting is not the only way.

Additionally, if you are looking for some other good FB groups for military/veteran real estate investors, send me a message and I'll share the links(will get taken down if posted here), might get straight to the source of someone who's done this in Guam.

If I have a contract usually I'll try to target flippers in the area looking at various sources doing whatever I can to get in touch with them.

All great sources.

I would say its the vast minority of investors that only buy sherrif sales.. its a pretty tight group of folks that use sherrif sales as primary sources.. 

Couldn't we just register the KS LLC as a foreign entity doing business in MO and avoid a second LLC?

I have been researching corporate structures and am getting some conflicting information.A tax adviser is suggesting that I setup an LLC in Wyoming, with a trust as the owner, and with me as the sole beneficiary of the trust.I read several articles that say I may have to register the LLC as a foreign entity in my state, New Jersey, because I would still be "transacting" in in my home state.I read some exemptions on what constitutes doing business though:(7) creating or acquiring indebtedness, mortgages, or security interests in real or personal property;(8) securing or collecting debts or enforcing mortgages or other security interests in property securing the debts and holding, protecting, or maintaining property so acquired;I'm trying to figure out what the bolded section means as far as owning income producing real estate, it looks like it may be exempt?