Make sure utilities are available, and that you have tap fees included in your estimate, as well as engineering (site plan), architectural plan, and other bits you might need to consider for your market (landscaping and costs of sale, for example).

They'll be ok with slower speeds, just for browsing and streaming.For routers and modems, just make sure you go with name brand devices and check reviews on tech sites.

Different lenders can serve different purposes. 

Naturally, I could go on their site but trust Bigger Pockets members more.

Have been on bigger pockets a while, but havent made full use of the site. 

I think you would be far better served joining an accountability group.  

So a community of these homes could definitely provide an affordable downsized housing option for active seniors (independent living style) - especially when you provide amenities on site, which will be required if you want to compete with other independent living style communities and apartment buildings.

One thing people haven't mentioned is look for your own ad on the key rental syndicated sites and see if it presents well. 

I was able to get them in touch with an off booking sites place that had an opening in town.

Their customer support is terrible and some of their software, but they have about 8x the site traffic in general than Airbnb and VRBO combined, surprisingly.