Thanks Rich and Driven for the replies, i have attached a sketch of what i am trying to achieve, sorry i didnt think of it right away. The line selection you made Driven is what i am looking to make and i can select that ok, the problem is i then want to use the soap skin plugin to achieve the curved side or hull type effect that i have sketched in my attachment. Once i have the line selected like you made Driven i cant seem to apply the soap skin effect to it as it says i need the closed face etc? If there is any more light you guys could shed i would be really grateful. Thanks again for your assistance, i appreciate it!

Hi guys, I am pretty new to all of this and i am trying to put together a design of a new handcycle (bike for a paraplegic) and i am having trouble with one part of my model. I have attached my project file here if anyone would perhaps like to take a look. I am trying to create almost like a boat hull type set up with the soap skin-bubble but i keep getting into trouble in the fact that i cannot select the whole outer line or frame of the shape in one selection and even when i try go around it and manually select it all and try and use the weld plugin to join the line it doesn't work or if i select it all i get a message telling me i need a shape with 3 or more closed edges. I'm sure someone will look at it and tell me its a simple newbie mistake and either fix it or tell me what i have done wrong. I'd be really interested and grateful to hear from anyone with more experience than myself. Thanks so much in advance! Grant.

Handcycle mock.skp