I'd agree with the H0 business. The days of passing off should be well and truly behind us, but sometimes there's no alternative. My only practical concern with that wagon is the length of it. I built a talgo pocket wagon from scratch some years ago, and it's the same size. The overhang on small radius track was considerable, and if the wagon was in anyway top heavy, she'd get pulled off the track and fall over. I suppose some of Leslie's style lead shot would work to keep a low centre of gravity, though.
Lastly, those wagons also had continental bogies along with the heavy duty sambre et meuse, the former being readily available, though they are being phased out on the networks on the island.
HTH
R.
P.s - we all have our moments - In a former life I once sent a letter to an archbishop explaining the fire alarm system when using incense. "Once you push the button in the Sanctuary, it will disable the fire alarm system, such that you may carry out incest related operations without interference".... Twas caught before it left, thankfully....