no way of building yur own for 200.
unless you know some people and can pull some strings.
i got the cab alone for free (dad paid for it since he knows the carpenter, the thing cost about 50$)
i am waiting for the speakers now since they dont have 8ohm ones at the shop (canceled the order for 16 ohm ones) and the speakers +shiping are going to run me at around 200$
then comes in the wires, handles, input jack, wheels (or something like it), the foam on the bottom and one of the sides isnt realy cheap either. the grille and corner-bump-thingies.
havent found any tolex around here (either green or other wacked up color hehe) but i doubt it's realy cheap
so, at total, imo the cab would run you around 400$ which is a tad more than 350€ .. so that makes it umm... 300quid?