convert 1.4 rear drum to disc

Hi everyone - I've read that upgrading the rear drum to disc is perhaps more cosmetic than actually to improve braking but I've got the chance of 4 discs/calipers/carriers from a 1.8, so based on what I've read I think for the back end I need rear hubs, handbrake cables and brake cables. Any ideas how much the hubs cost? I've changed motorcycle discs/calipers etc so I don't think this should be too difficult - though handbrakes are obviously new! Any advice on hub costs (and anything else) appreciated. Many thanks.

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