I'm already starting to feel the errors of my decisions to have 2 duck-unders to gain access to the operating area of the layout and I wonder how I will cope in 10 or 20 years time. I hear you Roachie! I'm a fair ways off from 60, but once I walked into my previous layout instead of ducking under it (sadly as it was being dis-assembled) I swore to myself - never again!
The duck-under is seductively attractive but it would really have to offer a lot to the layout to make me consider one again.
I built a lift up bridge section at the entry doorway, best thing ever. I had a fellow group member fit it for me as he has one on his layout, while mine is only a single track, his has 3 tracks & he has nice low relieve scenery over it as well.
Another fellow in the group a double curved section that also is protected by track circuit either side of the bridge that has a dead section when the bridge is lifted by others entering. Have seen several others that are also similar, Alan Brown has one that is also track circuited & also an excellent one.
Once seen how they are constructed, its not that hard but there are a couple of be awares in making them especially with the alingnment.