Can't find my camera batteries now... poor phone shot, but I'll try to update this tonight with some more angles and the LED on.
Most obviously, it has a rhino chassis hatch door sawn up and used as extra armour on the front. The middle plate is a window from the cardboard building that came with the 6th ed.
WHFB kit. Skulls hanging off sensor thingies are from goblin banner poles. The multi-melta is two meltagun barrels lodged into a sponson lascannon, with some extra armour from an ammocrate lid. Wait for next photo. It's built like a long-barrelled meltagun more than anything, and that's exactly what a multi-melta is... I mean, you don't get extra shots or anything. Top armour bit (over window) is possibly part of a LRT kit.
The window fram has tissue paper behind it, tinted with green ink. There's a led behind there - the green power light from the original Sega Master System! The battery cases I've been using are home-made, because I'm not sure whether to use a 6v N battery or a 3v cell (the size under motherboard batteries). The led needs two volts, so 1.55v cells are out. and yes, the switch is on the outside. Not-very-cunningly on the dread's back - you'll see...