Hi Norm The Bristol show was very busy and quite noisy so I'm not sure which company said they did commissions but I think it was Torri Laser at www.torrilaser.com the other company was JSModels at www.jsmodels.co.uk I think both companies do commissions though they will be expensive . The latter JS did the warehouses I mentioned take a look, looking cost nothing
. Your best option is scratch build and as John has suggested Plastruct do a range of profiles that may well be useful and going down that route will allow for some experimentation . This is what I will probably do myself as I intend to build a model of Barton street box for my self though that might be a while yet. It might also look at Peco ,Wills and Ratio for the box itself as they do all manner of things windows planking roof sheets ect. Which ever box you decide to model they all look good and will add to the layout. Jim