I'm going to be the devil on your shoulder here.

I wouldnt want the owner constantly looking at bookings and over my shoulder as I did my business, if i had a good track record.

That's just 1 of the monkeys on Europe's shoulder at the moment.

But you must also shoulder some burden of responsibility here as you allowed yourself to be talked into this. 

Take your time ZackI would try and find an old school father and son plumbing contractor in your town and get some quotes,,,be friendly and nice,,,plumbers go 100 yards for a nice clientAlso consider stopping by 3 of the biggest plumbing supply houses in your town and ask for a refferal on a good honest freindly family owned plumbing contractor who pays his billls on time,,,,,,good place to startAnd most important ,get a flat rate quote for the job,,,never pay a firm by the hour,,,its a loser,everybodys looking over there shoulder,,wondering how long its gonna take,,,,,get a quote and relax,,,,Hope that helpsDD in L.A.

I did see someone who blew their shoulder out on impact.  

You may have "The Donald" looking over his shoulder.  

I encourage you to check it out, it is a great investment for a 30 day 'look over my shoulder' type of course. 

It was awesome stuff not the boxed crap you see..  6  8 10 and 12 foot lengths with random widths truly art..

Either way, I would first look at the amount of available space in your rear yard (measure the lot width, which is probably 50' or so, and the distance from the rear property line to your house, which is hopefully >35') and see if you even have the space to build a 1 or 2 story unit that has your desired bed/bath count.