Sure, I've got one of those. The problem is that connecting several large items in series in zero-g is a nightmare - you need to synchronise multiple kerbals - keeping them within the right distance - then manoeuvre your engineer into a position between the part and the target (keeping the distance to a minimum, and hoping you won't bump into either and make then spin off). I had thought of using KAS to keep the part in reach, but that's not an option because you can't grab parts which have other parts attached. What would make a lot more sense would be to enable engineers to large parts in orbit, but enable it via an item in the tech tree, or limit the allowed mass based on the engineer's experience.