Need replacement cone speaker rebuild guidence

so after my dad died I was going through some old stuff in the garage and found his old old speakers. basically they are a reversed engineered set of old Bose 901's. back in the early 60's 30+ guys from Stanford chipped in and bought a pair. the engineers took em apart and put em back together. as such they had schematics and a parts list. they bought the stock parts direct from Bose (for what he told me was a cost of $200) and then they all put them together. I remember listening to them when I was young and at the time they sounded really loud. anyway.... the boxes themselves are in good shape but most of the cones are old and punctured and need to be replaced. luckily the separate outboard EQ box (can't think of anyway else to describe it, but I'm sure you know what I mean) is clean and works. So in his honor I would like to re-cone them and was looking for some ideas on replacement speakers. of course the design requires me to get 18 4" full range cones. I have never done a DIY project but have had the itch for years now and figure this would be a real easy start.

sorry for the long winded statement, but any thoughts on 4" replacement cones? is it even worth it? I know that these are not the most efficient speakers but I was planning on using them in the garage for the kids PS3 sound set up.

thanks

tested the speakers a few months ago and they actually sounded real good, minus the ripped cone effect, so i assume the crossovers are fine as is the EQ. I have no issues spending up to $35 per if it will make a noticeable difference over a $15, hence the reason I'm asking.

really looking forward to getting these things up and running to see what I can do. I know they are supposed to be placed "backwards". my dad had them hanging from the ceiling about 3 feet down pointed into the corners. I still feel that these things, in the large room that he had, had one of the largest, widest sound fields I have heard. of course I'm comparing them to HT speakers which are very directional.