How to use tanalised kahikatea

Someone gave me two planks of wood telling me it was Kahikatea that had been tanalised, one was 40mm thick the other 30mm but cut with a chain saw so had a very rough surface and 2 big knots, I thought about using it for outdoor chairs it being tanalised but then could not bear to think of cutting it up into bits, so table that could be used outdoors however I wanted to cut out those knots so it rendered some of it to bits, upon thicknessing it I realised the tanalising was only surface treatment, so I developed a design as I went along, the kahikatea being so white I thought some colour was needed and glued up some stringing using some very old jarrah, I thought the stringing would add some width and make all the joints have a reason for being there, the kahikatea is soft not sutable for the edge the 40mm looked thin around the edge so a hard edge of rimu seemed right
and the pieces I had that came out of the house I renovated were just right, this is the result with a quick sealer coat of epoxy treatment, it seems to have brought out the dark spots of the tanalising treatment that were not taken away in the machining, the top is 1660mm X 760mm which I think is a good size.
I have a fair amount of kahikatea left and some of the stringing and wanted the legs to have a theme with the top, I like the look of the rail to hold the table legs together with the wedges this method also makes for a table that can easily be dismantled for moving and as I intend to transport it to the other end of the country to me son it is necessary, the top took me a week to build and the legs another week now I can see that time again to do the finishing not that I will be on it the whole time as the polyurethane takes a while to dry in our winter.
Now I have a good lathe it is nice to find a worthwhile project for it and turning those pegs was good fun I had to get them correct the first time as I have nothing else to use so I am well pleased with myself, the ends of the tenons are left protruding for effect, the legs had no polyurethane on at the time of the photos so will have more contrast when finished.
Ho so much fun to build as at the start I had no idea other than a basic shape but it could have gone anywhere, just I'm not sure now its suitable to be put outside.