has anyone tried interchanging the necks? say a UV70's 4-string maple with black blocks neck to a natural finish Hybrid PJ 4 body? and what the deal with the MV4 with a bad action on the intrument review section? i'm currently saving up for a 4-string metro and leaning heavily towards an MV4 with single coils. and lastly, can i just change the stock Sadowsky knobs with aftermarket chrome ones? thanks in advance guys.