Garden Planning - The 8 year rotation

So I'm inside today... planning out my garden, for not only winter (i know im a little late for winter/fall harvest)  but also for my crop rotations over the next 8 years...  I will just do very broad planning at first using the elliot coleman 8-year crop rotation.  and then I will delve down deeper for the first few years as to more specifically what I want to plant.... so... Oregon sugar pod II snow pea, instead of just peas...

I just found another 8 year crop rotation chart... not sure from where... but somewhere on the internets.

Here is Elliot Coleman's 8-year rotation. (Stolen from the internets)

some more information found and stolen from the internets...  

Keeping in mind that Elliot Coleman lives in the northeast so different then my NorthWest climate... but i think crop rotation is crop rotation... and all of the same rules apply.

Potatoes follow sweet corn…because research has shown corn to be one of the preceding crops that most benefit the yield of potatoes.

Sweet Corn follows the cabbage family because, in contrast to many other crops, corn shows no yield decline when following a crop of brassicas. Secondly, the cabbage family can be undersown to a leguminous green manure which, when turned under the following spring, provides the most ideal growing conditions for sweet corn.

The Cabbage Family follows peas because the pea crop is finished and the ground is cleared [early] allowing a vigorous green manure crop to be established.

Peas follow tomatoes because they need an early seed bed, and tomatoes can be undersown to a non-winter-hardy green manure crop that provides soil protection over winter with no decomposition and regrowth problems in the spring.

Tomatoes follow beans in the rotation because this places them 4 years away from their close cousin, the potato.

Beans follow root crops because they are not known to be subject to the detrimental effect that certain root crops such as carrots and beets may exert in the following year.
Root Crops follow squash (and potatoes) because those two are good “cleaning” crops (they can be kept weed-free relatively easily), thus there are fewer weeds to contend with in the root crops, which are among the most difficult to keep cleanly cultivated. Second, squash has been shown to be a beneficial preceding crop for roots.

Squash is grown after potatoes in order to have the two “cleaning” crops back to back prior to the root crops, thus reducing weed problems in the root crops (19).