Thanks for your comments. A bit of detail on the enclosures...
They are built out of 16mm MDF (Medium Density Fibreboard), sometimes called craftwood. Brickwork was routed with a flat 'V' groove bit, then adjusted for a shallower cut for the cracks. Some areas where 3 cracks merged were routed to form a missing chip. The edges were done with a chamfering bit, all by hand to produce a rough effect.
It was then painted with 'wattyl stone finish'. The grout lines, cracks and edges were brush painted, then when dry, the rest using a roller. After the first coat, the cracks were marked in with a black artline marker, then two more coats of paint rolled on.
That's it. Also, all the timber used only came to $200! After fittings, glass, paint, accessories etc, the whole thing probably cost very close to $1000. In total it measures 1800mm high, 1900mm long and 520mm deep. All light and heat cages were custom made by myself.