I looked into it, be it at work i was looking at around $1500 I think for,
A pillars, B pillars, seat belt plastic in B pillar, front and rear grab handles, sun visors, Blue tooth plastic with lights in front of sunroof(wich I dont have one), all "airbag" little clips on AB pillars.
The C pillars I was going to wrap in the same material I was going to wrap the headliner with since GTI and JSW does not fit the same. and the C pillar in GTi is not the same at the JSW. so factor that cost and supplies.
not cheap, but very do able.