Re: Front load or rear load speakers?
Front mounting drivers is usually only important for speakers reproducing high-frequency sounds or ones with multiple drivers for coherence. As far as guitar speakers, they don't play high enough to make that huge of a difference, dispersion is affected negatively by shooting the sound through a "tube" but it's not really as big a deal as you'd think.
Technically, having the driver mounted perfectly aligned with the front baffle is the correct way to mount drivers.