Thank you all for your replies. I have read/seen the sources you mentioned and used them as a reference. As I said the model is unfinished, I will show you the complete one when it's ready. It may take some time, because I am still learning the 3D software. I would be grateful if anyone would post a photo or a drawing of a coal barge mentioned by Mr. Henry E. Whittle. Once again, thank you for your help.

Best regards,
Kaz