Thanks for the quick replies. It sounds like I’ll be best swapping to the 14.4v drills to reduce frustration at too short a run time - especially with an approx 5 hour charge time per battery. It’ll also be cheaper for now than looking at alternative batteries and chargers.

Simon - I’ve already looked at your build thread for that ;-) In a similar fashion, I intend to build a basic model following the Haynes guide, and then refine it once I’ve got the basics sorted and working.