If it's possible to use 16MB chips, wouldn't it be easier to use those then? I imagine it must be easier to desolder those 8MB chips and put 16MB chips in their place (to reach 32MB, which I think would be enough), than to piggy-back chips ontop of each other. There would also be less risk of breaking a pin on the chips while soldering them.
(this is just guesswork from my part ; I can't solder to save my life !)
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup