My kit turned up today. I've had a quick look in the box. As mentioned above, the propshaft will need replacing with something better. Apart from that, everything looks good.
I do think it might be a little ambitious for my first build. Although I am probably capable of putting it all together (the instructions seem to be very comprehensive), it would be a shame to do a less than perfect job through inexperience, especially since there's no possibility of having another go later.
I've got an Aeronaut Mowe 2 kit that I picked up at a good price on eBay. I think it makes sense to build that first, use it as a cheap way to try out things like finishing with epoxy, glassing, etc., then come back to the lobster boat if the Mowe turns out OK.