Anthony Supplebottom :
"but in this project the owner's budget really isn't the biggest issue"
What !
So a 139 in a four VVIP seats config will let more room for legs and shoulders
Seriously, have you seen the second hand 365N3 reg G-DOLF (ex James Dyson aircraft)
Very nice aircraft and she's got Emergency floatation gear fixed and removable parts !
The two fwd VIP seats can be put in a front looking side (sorry about my poor English) that is very pleasant for the pax.
you can find her on controller.com