Starting from scratch, my program went wacko!
The purpose of the drawing will be to get a parts list, pipe sizing, head loss. I will dim-out the fuge so you will have measurments but as far as length of pipes for plumbing the tank, I really can't say, things will change during the plumbing install. So this really just to get a good idea of what is going on and how you wnat to install it. Besides I can't draw spa-flex so you will/may find a better way to go up and down stairs.
Again just trying to provide a good outline for you to reduce frustration and kinda know what you're doing from the start!