body kit costs £1k
bodywork fitting £1k
respray minimum £1k more like £2k for a decent job
rear spacers £100
steering arms £250
steering rack limiters £50
front hub carriers £250
front wishbones £200
FRP specific dampers/springs £300 (new set would total £1042)
driveshafts £250

total= £4400

Thats assuming you get free delivery and fit all parts yourself, except professional fitting and cheap respray of body kit.

So easily £5k if you get decent respray.

If he doesnt want to pay import taxes then the far cheaper option is to buy an FRP over here and bring it to denmark then strip parts from it (or do a shell swap and dont get caught ).