Hi Chris/Eric, Yes I was using the parts listed but the outer and inner loops dont link up when using Anyrail which I've found to be pretty accurate in the past. I just wondered if somebody had completed an exercise building the real thing or using other software and found it works , or not! I try to avoid flexi track but I think that's the answer in short sections in two places. The layout looks good in principal but doesn't appear as straight forward. Perhaps Hornby should have another look at it. Chris