I might suggest trying to find some used solenoid draw stops if possible as they are quite involved units not only electrically, but as well, mechanically. I've seen several console online, esp on eBay. There may be inop consoles that have operating draw stops available quite reasonably.
In addition, you have to figure the amount of instantaneous current needed to operate them. Likewise, if you control them with a combination action (pistons) it is good practice to limit the duty cycle (on /off time pulse) so as not to burn the coils out.
All this to say, while it can be done, there is quite a bit to consider beyond just the draw stops themselves.
Rgds,
Ed