I've been working at this for the last 14 months, its due out for the first (only?) time at the NDMRS show on 22nd April.
It started with a Wile E Coyote key ring, and has turned into this:
2017-04-15 11.34.48 by lesmond2009, on Flickr
P8260018 by lesmond2009, on Flickr
2017-04-15 11.34.48 by lesmond2009, on Flickr
P8260021 by lesmond2009, on Flickr
Dimensions are 4' long x 18" wide x 30" high. Scale is Gnine, which is 1/2" to 1' on 9mm track, which works out at 8 1/2" gauge.
The ground is made from yellow extruded foam (free from many skips ), carved, joined and painted, then overlaid with sand where needed, on a plywood base.
Track is Tomix N gauge settrack, control is DC. It has been extensively tested and runs very well indeed.
The "locomotive" is a Kato chassis with a 3D printed footplate and scratch built top. The key ring is the Wile E Coyote figure, and used to be a putting machine before minor modification.
There is one more level of "rock" to add to the top, some detailing to finish - shed roof & door, crane needs finished, locomotive needs painted and the rocket engine finished (its a copper pipe to put some weight to the back with a big, red LED up it) but it all should be done with a week to spare.
All being well it will be well received as it is a bit out of the ordinary
Les