Design detailed thinking

It amuses me to think about some construction details in the evenings... There are some problems, sorry, opportunities to be solved/taken advantage of.

Some design thoughts...

1. 6mm MDF for the woofer support seems to be a bit flexible - it's not the original design spec "hardboard" which is HDF really, so I've considered using 6mm on the top of the sandwich, with 12mm below. That would leave the drivers in the same relative position but with more rigid support
2. Holding the woofer tube in place without the specified (and unavailable or ridiculously expensive) "cap hub" - how about another MDF base circle, with a 4.5" hole as a tight fit for the tube, and glued in? This would also make the speakers heavier in the base and thus more stable
3. The specified feet are just short lengths of 1.5" rod, and there are 5 of them; how about 
1. Only 3 - that would make them less likely to be wobbly, since anything more than 3 feet only makes for levelling problems
2. Spikes - a traditional way of seating loudspeakers
3. Sorbothane feet - moderately expensive on Ebay, and a great way to decouple from the floor
4. Rubber feet from Screwfix - 10 for £1.49!! Gotta be worth a go...
4. Some people have successfully bolted the woofer to the support, rather than gluing it, in order to simplify repair/modification - how to do this? There isn't much, if any, space for bolts/nuts above the rubber coupling. The only way I can to do this is to use very short bolts and countersink the nuts into the lower face of the support. That won't leave much of a thickness of MDF to hold the woofer...
5. No drawings of this, but there's the placement of the Speakon connector to be addressed. Choices include
1. On the base, on a longitudinal axis, on a separately attached support; this requires wires to be fed into the base and then up the woofer tube, with some visibility
2. In the base, vertically, easy then to feed the wires into the woofer tube
3. In the woofer tube! I saw one build that did that; provided it doesn't look too crap with a mismatch of curved tube vs. flat connector socket surround this could be the winner
6. The quantity of MDM-4 wadding will apparently just cover the woofer tube damping - there will be none left for the diffusor tubes :-(. I do have some Bonded Acetate Fibre (BAF) which is worth a try, otherwise it'll mean incurring more postage from Cybermarket, boo. I'll only know when/if I measure the speaker response and compare it to that specified by SL