I love the design portion of the process so need to be very careful not to overdo.

We would also have the option of taking a portion of the profit and investing in other things. 

However with it being a small multifamily, your comps are going to be ran very similar to comps that are ran for any single family home, comparing prices paid for recently sold homes that are comparable in size, style and location. 

what sizes??......

You can only deduct the business portion.

Additionally you will have a recorded easement agreement that specifies rights to rebuild, upgrade, who pays the portion of the ad valorem taxes attributable to the billboard, etc.

You can select various SOWs for kitchen, baths, etc, and it will create as separate worksheets for each area in the same spreadsheet.However, it is not as simple as it sounds and the size of document is difficult to share with contractors to make their bids. 

(My husband handles the funding portion)

There are budget contingencies of typically 20% depending on the size of the project.

Not every bed is the same size, and if you have more/less sq. ft. per the bedroom average, you might need to adjust (hopefully towards the positive).