[TCMJ1816]

This is an issue my team deals with pretty much every year (We have 50 members and our work space is roughly 12'x20' Plus a classroom that we use for meetings on occasion). As a team we do everything in our power to keep students on the subteam of their choice so at times we have had a build team of ~15 kids. We handle the situation in a couple of ways:

Our CAD and Programming sub-teams work in the hallways outside of our shop which keeps them close enough that if needed they can come ask questions to the builders but for the most part will stay out of the way, this helps out in a huge way to keep the space relatively usable.

Nearly everything in our shop is on wheels, so a the beginning of our meetings we roll everything out of the shop (including stuff like past robots, tools, hardware, etc.). This is another way to really optimize the space you have.

We avoid doing shifts on our build team because of the disconnect it often causes in projects but often do it for both CAD and Programming, often they either work in two or three hour chunks.

As far as your particular situation goes I would highly recommend that everyone has a dedicated space so sub-teams stay out of each others way (like a corner where all the cadders congregate).