After a bit of research I decided to buy a £15 plastic snowbee rod holder. Been playing with it and looks pretty strong, it's even got a hole though the location pin so that I can reinforce it with a ss bolt.
I'm going to trial it for a month and see if I can break it. If not I'm going to buy another 3 of them.
Looks Slow but is Fast
Member of the ebay Blue RIB cover club.