... if building to 00-Sf there is no completely fully functional chair based solution without modifying chairs The same applies to 00-BF, DOGA-Fine, and EM. Use of the Exactoscale gauge widened check rail chairs for EM works well albeit at the expense of slight gauge-narrowing; although it could be argued that 18.2mm for EM is over-gauge anyway! Martin Wynne wrote: Only P4 has a full set of functional chairs available (Exactoscale)....and ScaleSeven (from Off The Rails) ...100_010848_190000000.jpg 100_020909_230000000.jpg Sliding the chairs onto the rail is made "easier" by using separate keys Regards Dave R http://www.shapeways.com/shops/otr Last edited on 2 Jun 2015 17:00 by David R posted: 2 Jun 2015 18:17 from: madscientist Hayfield wrote: You have made some comparisons which I believe are incorrect and misleading I will use your costings and estimates on rail and timber strips and the cost of chairs, but my own calculations on chairs required. Please note a steep rise in the cost ...