Hi, Andy from Dexter's Cove Here.
Glad you like the kit, the resin parts are 3d printed epoxy, they are left slightly 'under-cured' to give them a bit of flexibility, it makes them less brittle and easier to finish, they will harden over time.
For those reading the thread, ridge tiles and strips of plasticard to finish the roof are included.
My shop is at www.dexterscove.com
I have recently introduced a range of figures in OO and O with N scale to follow..Check out the new signal box kit too.