OK - a few updates to my conversion.
I've done the mesh heads on the snare and tom1 (using v. cheap heads from the Birmingham Drum Centre (in the UK) - which, it seems, is closing down....)
Anyway, a few things I've found so far......
On the snare, having the resonating plate 'hanging' in a hole created by a 'doughnut' of white foam really didn't work for me, as the triggering was a touch hit and miss. I ended up refilling the 'doughnut' with the piece I'd cut out and the triggering is far more consistant.
I HAVE to get rid of the PCB/resistor thing, as I've had to crank the sensitivity right up - I need to double check the connections, but it really is a neccesity if you're burying the piezo and plate so deep in the mix......
Also, the overall xtalk and 'feel' now needs some tweaking to get it back where it was in terms of consistant triggering, but the trade-off with the superior 'feel' is well worth the extra effort.....
Overall, the playability of the mesh heads with the rearranged foam is like night and day - the rebound is like a super-tight acoustic head and allows for some pretty lazy techniques to sound far better than they should!
If anyone has any definitive wiring diagrams and info re. the PCB (rather than the old fashioned resistor) conversion, I'd be grateful to see them, as I really haven't got a clue about electronics......