My question is how often should I check in on the property to inspect the work and with the contractor to get updates, without becoming burdensome?

You may be able to get a company to do the epoxy paint do the work and have them polish the floor before application.  

my girlfriend and I are taking this as a day off of work and driving by about 15 properties today ;)

Every time you might have to do work and maybe have a month empty.

The difference between a lot of the people that failed, and our winning team, was realizing that somethings just don't work, and we needed to make time for things that did.

If this is a main bath where it will see use of people getting ready for work and school, I would not put in a pedestal sink. 

So the lesson is not take any shortcuts on vetting people no matter who is recommending them and you should be fine.

The types of improvements that borrowers may make using Section 203(k) financing include: structural alterations and reconstruction modernization and improvements to the home's functionelimination of health and safety hazardschanges that improve appearance and eliminate obsolescencereconditioning or replacing plumbing; installing a well and/or septic systemadding or replacing roofing, gutters, and downspoutsadding or replacing floors and/or floor treatmentsmajor landscape work and site improvementsenhancing accessibility for a disabled personmaking energy conservation improvementsHUD requires that properties financed under this program meet certain basic energy efficiency and structural standards.For more information visit: HUD PortalHope this helps!

So for you to do your business, work and flip houses will definitely be a challenge.

Julie & I had some real luck buying multi-unit (duplexes in this case) that needed some serious work and brining them up to market, but that took some real capital.