Scale: 1/35
Source: Star Wars: Essential Guide to Vehicles & Vessels by Bill Smith

This is a scratch built AT-PT Walker. I'm not sure which Star Wars novel it comes from (too many read!), but it is featured on page 4 of the Essential Guide to Vehicles and Vessels.

The AT-PT is 1/35 scale and was built using a combination of "classic" scratch building and designing parts in CAD and building my own pieces in SLA. But, the bottom line is, it all came together like any model and was painted using Tamiya paint, pastel chalks and washes.

Image: Head on view

Image: Rear view

Image: Top view

Image: Side view