It's likely the original 'Lab' pod used a base from a Cargo pod. I've already made one of those so that's what I will using as a starting point. Seen here with many of the cargo pods' unwanted poygons deleted.

What's left is being used to check dimensions and positioning. The pods' connected tube framework looks accurate when the overlaid on the reference photos' I'm using.

However the base side rails wil need to be redone to improve their profile shape. So those parts will be the next bits to form and from there the remainder of the Lab pod looks straightforward enough to complete.