Decided to alter the profile

Before

After

I wasn't happy with the profile shape of the cab plus the bar stool I bought could only be raised so far before your knees banged into the underside of the cab. After much though I finally decided to use my jig-saw and luckily didn't wreck the whole thing. I'm much happier now with the look as well as there being more room for your legs.

the "after" picture is a bit dark so heres the original sketch comparing the before/after shapes: