None of the old Darnell boats were 100%. I think most people buying them know that. The masters for these boats date back to the 1970's. Information was much more scarce than it is now, so modellers did the best they could.
Regarding the Alan Poole boat, the information I received was that the original tools were getting past their best and not suitable for batch production. They were originally built to do a few hulls at the most, so they needed renewing. Someone mentioned that a well known UK model submarine producer was in possession of the tools, but that could well be chinese whispers, thus I was vague regarding their present location.
I recall the 'cheap hulls for members' kite flown in the past. Unfortunately, open ended deadlines like 'sometime in the next eighteen months' can easily extend into two, three, four years or never ever. Rather than restrict availability of hulls to your own membership, which often tends to limit demand to one or two hulls why not consider offering limited run batches of hull, and promote them on forums like this. Getting the work done by a good professional GRP worker will ensure the standard is maintained, and should ensure the hulls are made in a timely manner. Quantity tends to result in lower prices for all, and if you want to offer a further incentive for your own members, factor in an extra discount for them.
I've seen Jim's work on his OTW Vanguard, his modelling skills are excellent, so I'm sure he'll make a good job of any boat he decides to get.