Ermm well I would say that most Windows Forms applications are MDI, because they allow you to manage child forms easier, and allow you to implement interfaces easier. They also look more professional.

So this 'seems' to be quite a good solution to using Acknex in C#. I emphasise 'seem' because there might be some things i havent encountered yet.

I'm currently creating a MDI application for use with Game Studio, so this solution seems to be fine for me.