This week's update.
Finished the first test assembly this week. Unfortunately the cocking linkage gave some unexpected grief, mainly due to the slightly odd way it's cocked. But reverted to plan B which seemed to fix it in the short term (always have a plan B!)

Then had a few shots to test the trigger. No complications there which was nice. Managed about 20 shots before one of the pins in the cocking linkage gave up (I don't think my fleabay 'hardened' steel pins are very hard at all).

Only run it at very low power (about 3 ft-lb at a guess). So no feedback on the recoil just yet. Will order some spares and rebuild next week, then start upping the power slowly.