Leprechaun wrote:... strive to actually become successful in surfing. ... I was thinking a board around 5'0"... What do you all think?
Try to rent a 5', if that's an option, so you can experience surfing it before you start building. Maybe a Sweet Potato 5'0 or a Baked Potato 5'1, both are the Firewire brand.
If after trying this you still want to go ahead and build a 5 foot board, then go for it!