First off chap I'd ensure the thing is secure as you don't want the rat boys swiping it from you. Once you've done that lob your wheels and zorst on. First job I would de badge the boot. Dependent on the condition of your shocks you may get away with just a spring kit for a while (best off with a 35mm drop). Source some 3i bumpers and have them painted to match your car and fit a 3i spoiler (only real money here will be the painting. Clear indicators and repeaters and maybe some tinted lights.

Not OTT and shouldn't cost the earth

De-badgeing FREE
Springs £70 (new)
3i bumpers £100 pair (second hand)
3i spoiler £20 (second hand)
Clear indicators £30 (new)
Repeaters £10 (new)
Tinted lights £50 (new)

Just my thinking though mate