Jethro, just in case you don't know, the category you've chosen for the post means "mock-up images (done with Photoshop)"
But I believe you really made a shot, and the model number should be B5TL instead.
Yet I wonder if the 5-litre engine alone (in B5TL) could effectively drive the bus to move
while powering the massive air-conditioning system (as in most Hong Kong double-deckers) at the same time, unless it is a hybrid.
So I guess the new bus would be more likely a B5LH or a two-axle B8L——either one shall make its first ever appearance in Hong Kong.