I have a part from which I want to take a mould - it's around 50cm long by 46cm wide at the widest point.  I'm unsure as to whether the ready mixed epoxy fibre kit would be best or the uni mould kit, and which size to use if the former.  Guidance on this would be great.

It's a small motorcycle fairing and is curved so part of it touches the board and the top is about 6 inches of the board.  I've watched the video and saw that when making a small part, modelling clay is used to created flanges. I could do that with the part it would just need a fair amount of it (46cm across by about 15cm high) to bring the moulding cloth/putty down to the board. Is that the best thing to do? Or better to cut out sign board and make flanges that way? 

Thanks Matt.  With it being a fairing, it needs to remain pretty stiff at high speed, do you think two layers of carbon and a sandwich in between would be sufficient? Or more carbon? Its fixed at each edge with bolts so the bolt areas need to be robust as that's what carries the stress at speed.  The first couple I make will just be standard wet layups, not vac'd.  I plan to use peel ply on the back for a decent finish (I've done this before with wet layup to good effect).

Would you also use carbon tape around the edges between the carbon layers or not neccessary? I'm thinking that would give thickness and reinforcement to the bolt areas.