Well they weigh in at about 40Lb or so depending upon what you've used to to waterproof them, slat thickness etc. Easy to carry using the strap across your shoulder or cross torso for longer distances. If it rains they make excellent shelters , kind of turtle like .
Traditional ones were woven willow and animal skins originally. This evolved into the woven slats made from fresh cut or riven timber. Ash is especially favoured as it bends well when wet . Calico , as it shrinks when wet to tighten the skin up has been used for the last few centuries and pitch or tar to waterproof them took over from lanolin / animal fat as more durable. you
The ones we did at Dunbar are unique as they do have "ends" but that was because we couldn't get enough thin and wet slats to bend them as well wanted so rather than let people down we adapted the design to suit.
Yes they paddle rather well but not in the traditional sense of side paddling . You use a figure of 8 motion in the water and draw the boat towards the paddle . If you side paddle you merely spin round. You can side paddle using a different technique which I haven't mastered . They were and still are used on certain rivers as they are highly portable, manoeuvrable and have a very shallow draught of about 4" depending upon your weight displacement. Fishermen set nets using them as they don't disturb the fish much.
One has been used to cross the channel to France some years back but the paddler was an ex Royal marine commando , so not you're everyday guy .
Sadly Pete the addition of bulwarks does nothing for directional ability, if you don't paddle properly you spin like a top.
They are best stored hung by the carrying strap not yet fitted on this one but the advantage of the bulwarks is you can stand them on end easier rather than hung up.
Great fun to play about in and kids love them.
NB like at my model engineering club we have NO ADULTS , merely kids ranging in age from 12 to 93

away from our wives supervision.
Any questions ask me and I'll try to get answers from Dave ( right hand end of photo) who's been building them for over 22 years that I know of and is in the coracle society.