Bought this off eBay for £10.
Three days later and after a little TLC:
Side sponsons, frag launchers all scratch built. Assault cannon were taken from the Taurox. Multi-melta turret is converted from the back of a Vindicator and a Centurion Power Drill. The paint on the tank's right hand side was super thick and bobbly at times - it's clear the primer was applied in a damp environment. Had to spend quite a few hours scraping it off, and there's still bits of it in places. Still, overall, very pleased with the result. My Inquisition can now unload their Death Cultists/Crusaders/ Repentia allies in style.
Total build time was probably around twelve hours. Total paint time around three. Still needs a bit of MiG Urban Rubble pigment added to tracks and tank body, but it's now tabletop ready.