I sell a kit that removes a lot of the work you went thru to accomplish this. Its an all inclusive kit that contains all the screws , mountings, and couplings needed to attach to any veeder root ever manufactured. It takes approximately 15 minutes to install without the wiring, and sells for $150 plus shipping , with all new parts.
I have left the wiring part up to the individual pump owners because there is such a diversity of manners in which to activate the drive system, depending on the pump being used.
Your nozzle switch is another good one in a long list of methods available. Several members have used a 12 volt voltage reducer to minimize the danger in the switch mechanism by using 12 volts for that part of the system. Others simply activate the system by using the nozzle rest linkage to activate an on/off switch. There are many ways to activate the drive mechanism, and yours is another welcome addition.

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Everything Cities Service
Specializing in old Gas Pumps
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