I want to get my motor mount inline with the prop shaft and fitted into the hull before I add the plywood side skins, but my order for a solid coupling is taking some time to arrive as I understand that all of the prop shafts and couplings from modelboatbits are "made to order" by Steve.
As I was cleaning up in the garage this afternoon (only slightly - I can hardly move in my garage until I get rid of my milling machine!) I stumbled across a piece of alloy bar that was almost the same diameter as a Powerflex coupling, so I chopped it to length, faced the ends and drilled a 5mm hole in each end (to the same depth as the Powerflex coupling) to make a quick "alignment shaft".
I was going to cross drill the holes and tap them to take a couple of 3mm grub screws - but I couldn't find any grubs screws laying around (of any usable size), so I will just use this alignment shaft as a "push-fit" so I can get on and make a plywood bed on which to fix a water-cooled motor mount.
At this stage, I am not sure if I will try to run this Swordsman with water-cooling (for the speed controller and motor mount) or not, but the motor mounts that I use are quite inexpensive and I fit them into all of my hulls as it makes it so easy to remove, share, or change the motors - so the "water-cooled" motor mount will be fitted whether the boat ends up running "dry" or water-cooled.
Now I need to have a "dig" in my workshop (shed) to see if I can find a suitable plywood off-cut to make a suitable bed to fix the motor mount onto.