I have an Elnagh Super D106 which I bought new in 2006. It is built on a Renault Master and has a 3l turbo engine.
I have about 40,000 Km done in it and it has served me really well. They are generally a well finished 'van with many 'extras'. Would I buy another one - Yes I would. I bought it in Germany and I think it was good value for money. At the time I paid about €56,000 for it including the extras I had fitted and if I bought here in Cork (there was a dealer here then) it would have cost c.€70,000.
Of course you should have a test done on the base vehicle and on the habitation element like any other van.
I hope it works out well for you.
Len