I've talked with someone who knows about biped construction, and found out some nasty differences that are making lairshaping unnecessarily painful.
Bipeds only ever need ONE type of raw resource to generate a construction unit. The only minor problem is that to complete a building, they need to switch between 4-5 classes. However, seeing as you could start more than one building up at a time (much more difficult to do in lairs, especially if you're just putting the first room in)... you can easily grind loads of one type of construction unit and slap it on all the buildings, then just switch to the next school... rinse and repeat.
Lairshapers, on the other hand, have to deal with ALL construction units requiring AT LEAST 2 raw resources to create. Many require 3 raw resources and 1 type (which is one of the most commonly used) requires FOUR!
The problem with this is that having to deal with multiple types of resources means we CANNOT use a 1-stack only cargo disk effectively. It also means we need silos FAR more than bipeds do, and it's much more trouble to get silos up in a lair than it is to place and maky MANY biped siloson a grass field.
This class NEEDS better silos in lairs that can store MULTIPLE construction components (maybe make special silos that can only store stacks of certain types of items used in lairshaping constructions), and flying cargo disks that have high bulk capacity and canhave 2-3 stacks on it. As it is, not having these things dragons need for their radically different construction school is imbalancing construction to the point where bipeds would have a much easier time building than dragons. Also, seeing as adults/ancients are MUCH larger than anything else, why shouldn't they be able to carry a lot more, AND harvest a lot more of a resource with each dig (it doesn't make sense that an ancient can harvest the same amount of resources per dig with a claw larger than a dryad doing the same job with tiny tools).
Lairshaping seems fine for the most part,but we need to be able to make different equipment structures to accommodate the different way the class works. Personally I find lairshaping is far too painful with having to go all over the place to farm different resources just to make one type of construction unit. It needs to be brought in line with other classes so it's a fun grind, not an absurdly difficult, tedious grind.