Thanks torpedoman, i was trying to find a more natural wood preservative. Was at the store the other day and read the label on the linseed oil, and found it has chemicals added to it . Kerosene has the red dye in it, and who knows how many other chems.
HOWEVER.. good news! I can get free wood. There is a place near me that gives away the wood from pallets. Big stuff too. 8ft long 4x4s 2x4s , and 1x pretty much whatever. So as long as pallet wood is untreated I 'll use it, and re-make stuff as it rots away. It'll be good practice for my son in learning woodworking. Just have to be extra careful to watch out for nails.
Regards, Mark