Just now finishing up putting 3/8" eng. hardwood in my Dutch Star. In the picture you can see how Newmar has a ramp that the rollers come up on, I just beveled the wood enough to get the wood under the metal ramp plate and no problems with the slide coming in. You just need to look at how your slide works. Before I started gluing the wood down I didcut some 3/8" plywood and screwed them down in front of the five rollers and brought the slide in and out to make sure everything worked.
Also, Ernie Ekberg who is a member here on IRV2, has a Yahoo site that shows pictures of many RVs he has done. I found several Dutch Stars on his site with lots of pictures, I learned a lot. I've got new floor vents on order and my coach is done. I not a carpenter and have never worked in any building trade, but if you can take your time and do your research it is a doable DYI project.
2003 Dutch Star, 3126B Cat.