Green monsters are decent machines...
They come in three types
Liner kit
Shader kit
And color machine kit.
The green monster was a project machine covered in
Machine-gun magazine
I own a color machine...
A little light for my tastes
( I like next gen machines)
They use the true spring arm bars
And I learned slot about machine functions
And diagnostics from building up this machine
And reading the magazines...
I have also used there crown standard coils
On three other machines I built up using the knowledge
I got from building the green monster.
Hope this helps a little