Yes, metric v imperial is a matter of concern. Glynn Guest’s solution is probably best and most practicable. As Editor I cannot readily change all the measurements in an article from one to the other. The other consideration is that many scale models, including kits, are built to 1/12, 1/24, 1/32, 1/48, 1/72 and are essentially imperial based. I can certainly request future contributions to use both measurements where possible, but it would not be practicable for articles already within the system. Another point is that most existing plans in our plans service are in imperial measurements and it would not be practicable to re-legend them all. The half-way house suggested by Glynn Guest is a sensible solution – perhaps that is why his free plan contributions are so popular!