Hi Nial and welcome to the Forum - there are a growing number of fellow smoking enthusiasts this side of the Atlantic. Where in Ireland are you from?
What is the smoker that you bought and what have you smoked on it. The price of the smoker by no means dictates how good it is for smoking food. With simple modifications you could produce great tasting meat on many of the cheapest of smokers.
Regardless of which part of Ireland that you are from please feel welcome to join us in the UK Smokers group. This is visible to everyone in the main forum too, however if you post a question that is more specific to the UK and Ireland then you may get a faster response in there.
Don't necessarily set your ultimate goal as being a reverse flow trailer build. They are nice smokers but it will really depend on what you want to smoke and in what quantities. If you intend to go commercial then I can understand, however for social gatherings I have found that I usually need a mix of units for any one event. I may have pulled pork in one, ribs in another and possibly a chicken or some corn bread in a third. Just having one big smoker can sometimes limit versatility.
The WSM is a good smoker and if you got yourself a 57 cm one of those and used it in conjunction with your current offset you may not find you need anything else. I do a lot of smoking, some commercially, and I find that in many situations a couple of simple Weber 57 cm kettles are invaluable.
It is great that you are spreading the word in Ireland and I look forward to reading your posts. One thing that you should remember is that we love pictures on here. There is nothing like a good picture of what you have smoked to get all of our mouths watering