Harold,
I'm really fond of the look handlaid code 55 in HO. Your work is absolutely incredible!
I'm planning on doing a 4x8 logging railway in HO and handlaying in code 55 as well. I've done a few practice sections of track and have to perfect some of my turnout construction techniques. I'm considering laying the entire railway in twig ties instead of nice square basswood from the hobby store. In my initial trials, I've simply cut twigs from the garden, with about a centre diametre of 3/32", with a pair of side cutters to the approximate length of the tie. Since none of the ties have flat bottoms, I apply a thick layer of white glue down on the roadbed. I then lay the ties by eye and let them set in the glue. Once dry, I sand the top surface flat until about half the initial twig is removed. Overall, I'm impressed with the fact that the ties still have their bark on the side faces. The biggest issue I've found so far is that it is difficult to get spikes to penetrate throught the thick layer of glue. With some dirt ballast, the overall effect shouldn't be too bad. Now I just have to get started on the layout!
-Bill