They all vary in size just to keep you guessing Bwahaha!
Seriously though I do not have the best of tools in my garage, almost all my saws and routers and everything are Ryobi tools.
The base sizes for a 3.7v is 2"w x 3.5"t x 1"d
The base size for a VV is 2"w x 4.25"t x 1"d
Add .25" to height for catch cup
+ or - a hair on sizes due to sanding and stuff
I will have to slowly start upgrading my wood working tools.
As I have mentioned in the past I am not a wood worker by trade, that's why each batch has gotten a little better as I have gone along.
I am learning as I go here, but with the last batch that went out, I think I'm a fairly quick learner.
lol now if these were trailers or bbq smokers and I was using my welder/plasma cutter, that's where I shine =)