Top Tip on the ariel Col - hadn't though about it getting ripped off when an arm goes !
I use this stuff to make bits up - it's much easier to work with than Carbon Fibre Sheet.
http://www.ebay.co.uk/itm/1-6mm-Fibr...item43bf3855cc
Looking forward to the Tri - fancy a go myself at some point ! I like the 'Bat Bone' as it's simple to fix with wooden arms when it goes wrong!