Friends of ours have a 16ft Lund side console with a bimini on it, keeps them out of the weather and looks pretty good as well. I'm sure it would work fine on a tiller.
If you guys want a good set of batteries, buy a set of Eneloops and a decent charger (i just picked up a La Crosse BC700).. It will charge any AAA or AA NiCad/NiMH and will restore/refresh any of your old rechargeables as well. I've had too many packs of 'brand new' Duracells be completely dead out of the box to waste anymore $$$ on store bought batteries.