Logic commands and design objects

Hi at all. I'm new in grasshopper, i'm trying to design my first project with grass.

I have a little problem about some logics commands. I should build a capsule home for 4-6 people, so the lenght is variable. My idea was that the lenght could be modified at top of the algorithm with the selection, through a numb.slider, if the capsule home is for 4 or 6 people, so all surfaces would change with a single command. The problem is how to transfer the results from the logics commands to the object that grasshopper should create as the translation of a curve or to define the lenght of the extrusion of a curve starting from the number of the people who occupy the capsule.

Thanx