I need an app!

When someone creates an app that can do the following – I will buy an iPad.

Here is what I need and would be fantastic for both the commercial and residential door industry.  I go out to measure doors at an end users facility all the time.  I might measure one door or forty.  I would love an app that I could use to write all the measurements and necessary information at each opening.   

This is what I currently carry when I measure a door:

Pencil

Tape Measure
Clip Board
Work Sheet 
Smart Phone to take pictures with

I also have to carry my keys and business cards.

An app would need to allow me to draw the opening with my finger or stylus, insert all the measurements, take a picture of the existing door and then repeat for the next opening.  

That shouldn’t be too hard, right?  Get to it please!