KH 300 unit from Vintage Radio - anybody use this???

Lots of reading to do so cannot (or should not) judge by only one or two pics. Price at $320. (CDN) about half of what some greedy sellers are commanding for 'well-used' factory AM/FM units. There are speaker issues to deal with when upgrading from very common AM - especially when only a 4 by 10" in the dash. While most of our cars have provisions for pair of 6 by 9's at rear package area, what if rear defrost option for right side is something you wish to retain? I have relocated the blower unit to just below orig. mount area in the past but, with two speakers mounted in the back, they have to share the one 'speaker box' - yes, the trunk itself.
Very few, if any, provisions for extra front speakers since not a lot of room in the kick-panels and, mutilating the main door panels is a definite no no. I think there were small speakers mounted at top (left and right) sides of dash top, but I haven't seen any since all of my cars were only AM.