I run a mattoon on one of my bikes, your going to have to machine your stock inner and pp if you want to fit 8 plates in there. Contact wheelman chassis he can do it for you. But I've had no issues at all with my Mattoon basket
Not sure if this will work for you but I have a set of shear bb pipes with a 48mm flange on them, chrome and pretty lol with silencers will sell to you for cheap