more MG/ seatbelt questions

amazingly just found 1/32 brass tubing – doing the math I realize this scales down to @ 38mm at 1/48 scale – just wanted feedback as to acceptability for replicating the MG151/20mm cannon on a Tamiya FW190 F8 as it seems to be close match to kit’s own armament as I doubt I will be able to find 1/64

here is the manufacturers URL

http://www.specialshapes.com/brasstubing.asp

also gearing up for the 1/48 Hasegawa Ju 87 – are regular Luftwaffe seatbelts accurate ? I haven’t seen Stuka seatbelts in 1/48, only the 1/32 Eduard belts

Thanks

Dog