Thanks guys!
David, I'd like to try some teak oil next, do you think it will be lighter than the tung oil?
Vector, I have tried one aluminum gutsert, but for the rest I have made PVC ones. I figured the PVC would glue up better than the aluminum ones. I'm not sure if there's much sound difference between the two yet, I'll have to do more experimenting. For guts I use mostly GK, and Wade's SR 11s, but plan on putting in an order soon to try out a couple other different sets from Wade. I do like the 11s though.
I've played around making my own and had some success, but for the price of them, I'll just keep buying them for now, and try again down the road maybe.
Matt