Building a Building Thursday, June 10, 2010 I've been working on kitbashing some 15mm scale buildings for use with my recently painted Critical Mass Games miniatures. I'm using the excellent Urban Mammoth Platform Builder: it's so versatile that you can build almost anything you can think of. Here's my first attempt: At £12 for 13 sprues (which would be enough to make several buildings like the one above, the Large Platform Builder box is great value. I will definitely be buying more!