I am not familiar with your county requirements but a Professional Engineer (PE) will more than likely be required to stamp all drawings. 

Preferably with a company you've worked with before and would confidently give a stamp of approval to.

IN most states plumbing fixtures etc are stamped state approved from shower inserts to all other things.. 

The seller paid all the transfer taxes and doc stamps. 

Yes a hand written letter and envelope and live stamp is much more likely to be opened and read.

That's the approval stamp you need for this kind of business.  

Unemployment, food stamps, housing assistance, and all these other programs are supposed to be safety nets.

@Carly M.If you sell it, you will no longer get income from this property.Selling the property and purchasing another property will subject you to a good amount of expenses(title work, realtor commission, stamp tax, etc). 

Investment property is not really viable in the UK due to stamp duty and other policies that kind of punish those who own multiple homes, so we're looking in the US.

I'm homeless (staying with relatives, & on food stamps).