That's cool. Not sure it works so well without the actual TF font to support it as a faction logo substitute tho - it is kinda obscure.
My 2 cents -
As the forum banner it really should read as 'Ozformers Transformers Collectors Australia' somewhere - there is nothing to say what OTCA stands for otherwise. Maybe have 'Transformers Collectors Australia' like the 'Robots In Disguise' in that logo to match the font.
The sepia grade in the background, instead of red or purple looks strange, I prefer the previous vertical grade too.
That is if I haven't completely missed the point of turning OTCA ('Oz Toy Collectors Alliance'?) into a more generic toy forum.