Help! DIY 4 amp L297/6203 driver

[tribbles]

Like so?

Yes (from my side ).

Ok so Kwackers option is easy to do and gives me adjustable vref with a fixed idle current at 25% (which could be changed by swapping out the 19 K resistor?) and Tribbles options uses a few more trim pots but means I can easily adjust Vref max, vref hold and the delay time. Correct?

Yes - you could even put an open-ended trim instead of the 19K to make that variable.

For the trimmers am I looking at quality multiturn (£1 each) or will the cheap low wattage single turn (10p) be ok? would need 9 for 3 axis.

I don't see a problem with cheap.

If you were to put all 3 on the same board, you could use a single PIC to control them all - then there'd only be one pair of trimmers for the duration/hold...