Using the idea of a cheapo watch and velcro from others I had a go myself.
All of £7.99 from the internet
http://www.ebay.co.uk/itm/INFANTRY-INFILTRATOR-Mens-Quartz-Wrist-Watch-Sport-Military-Tactical-Army-Black-/181934724988?hash=item2a5c27977c:g:1I0AAOSwLzdWSaXz
please excuse the name, but the watch is almost clock sized.
The horns were then sawn off, I toyed briefly with the idea of using the ‘holes’ in the case to mount it but opted to use velcro, one of the switches and its location.
All pretty self explanatory.









Suitably ‘Blue Peter’-ish but no dash boards or wallets here harmed.