I know this is an old thread, but I have two Hemingway kits, a “set over center” and a “tailstock die holder”. I’m generally pleased with the total cost of the kits, the clarity of drawings and the design concepts The tailstock die holder is especially clever, and I have not seen a completed equivalent. The instructions are minimal, so you do need some judgment on order of operations.
One somewhat annoying habit is how the plans mix metric, imperial, decimals and fractions. It would be so much easier sticking to either metric or imperial decimals. Same with threads…either metric or UN threads…the current kit calls for a 7/8-26 thread. It’s easy enough to change, but…unnecessary.
Another point: The kits are really that…mostly raw stock. With even a modest inventory, one could probably source most or all of the material. An exception is a machinable MT2 or MT3 taper…but this could also be made as a subgoal, or sourced otherwise.
Otherwise these kits are really usable when completed, amusing and satisfying in use.