There are plenty of other options that are 4% plus as well If you don't like the mobile only format. 

Are there any meetup groups that you know of, or other formats that welcome new members?

I'm no expert and I don't really care about technology(there are tons of weird formatting principals, block sizes, hash rates, a lot of gibberish to me when digging into the intricacies of BTC).

The LLC formation process involves completing paperwork and filing with the secretary of state, paying a formation fee, and creating an operating agreement.

I ran the numbers copying his format and found the absolute maximum I can purchase the property for and still have positive cashflow.

You should clean it up a little using tabs and so forth so that it looks property formated and professional.

We use their stuff in an image format too to post online/email. 

For a rental I would look at using large format tiles to speed up the build time.

What format - letters, postcards, hard-written, hand-written copies, etc?

Both postcard and typed letter format.