Once completed will I have to treat the wood on my cabin?

Your cabin, if left untreated will naturally turn grey, this is the effect of the ultra violet rays that will break down a woods finish, the more pigment a wood has the better it will resist UVA rays. A darker wood will maintain its colour for longer. You can apply linseed oil, which is the traditional method. Here at Canada Wood we use Cutek, a treatment that is specially formulated to resist fungus and mould, it is also designed to penetrate deeply, providing water repellancy. This treatment also gives you the option of  choosing the colour you wish your cabin to maintain, as you may prefere the natural greying, or may wish to stain the wood completely, there are various coulours to choose from.