Just a thought I felt I should share. About 10 years ago I started building my dream layout after 2 years of planning. It works fantastically. N-guager has seen it and can attest to my claim. I feel it was perfect as it had everything I wanted. there are 2 hidden yards. one east bound one westbound they are good. I just made some minor improvements to them that a friend suggested. The problem I have is the access tracks to the hidden yards are difficult to get to. you have to crawl under the layout to get to them for maintenance or rare derailments. In 07 I had a stroke. I can no longer get on my knees to crawl. there go the problem and wished foresight. No you can't plan for everything. You can plan on hopefully living to be a senior citizen. who cant crawl any more or reach as far as you used to. how about narrow Isle ways and possible walker or wheel chair in the future. Just some food for thought. Before you say just start over, I can't and you might not be able to either. Or you may have the perfect layout (for you). Oh yeah I was only 51 when I had a stroke.