HI welcome to the site.
I have built several Mobile Marine kits as well as kits from other suppliers and find that they all have their good points.
The Lady Jan makes into a nice detailed model and the fact that you can buy it in easy stages appeals to many modellers but it does require some skill and effort on the part of the builder to achieve a reasonable finish.
White metal fittings from whatever source need some careful fettling to remove the inevitable flash but this then makes the part much more of a personal product than one that may be mass produced.
I agree the size fits well into most cars and the internal space coupled with the two piece superstructure would make a good project for a model steamer.
There are pictures on the web site of finished models and if you search the internet under Empire Tugs you will find plenty of detail of the various craft of which this model is representative.
I am attaching a picture of my model for your info.
Good luck with your research and I hope you enjoy completing your model.
Dave