Remember that a great kilt (or feilidh-mor) is essentially a length of untailored cloth. We sell tartan yard goods here:

http://giftshop.scottishtartans.org/material.html

You'd need approximately 4 yards. Go for the heavier weights if you can (DO NOT order the spring weight for this)!

If you really want to go whole hog for your reenactment, we could have the tartan wove for you in authentic 18th century colors, using our custom weave service.
http://giftshop.scottishtartans.org/custom.htm

(You'd need to order 8 yards as this would come singe-width).

The custom option would cost more, but I would argue that it would do you well for both your purposes, so you would not need the ancient Campbell.
Let me know if you have any other questions.