Base E is for all things BIG, and as the largest base  it measures : 12.8" x 5.5"
 
It was designed to be used with the following carving templates : 
 Truck cab (think Optimus Prime) 
Fire Truck (coming soon) 
 
You can either purchase : 
The base only (if you already have compatible templates) 
The templates only (if you already have  BASE E)
or the complete kit - if you don't already have a base or side templates. 
 
Want to know more about the kits? You can check out the full-length FREE tutorials and all the info you need in the link below 
https://dinkydoodle-designs-learning-zone.teachable.com/p/ultimate-vehicle-class
 
Want to know how many people this cake will feed? Why not watch Dawn's tutorial here on how she works this out using the dimensions given above: https://dinkydoodle-designs-learning-zone.teachable.com/courses/ultimate-vehicle-class/lectures/48574434