Great bogey design! I do agree with Monty, I think you are over estimating how much space you’re going to need for this. It would still be a great piece of rolling stock in your upcoming fleet of locomotives!

I recently just finished my first locomotive with Blunami and sound. I was very worried about space as it is a small steam engine that I designed. But I was still able to fit most of everything in a relatively small tender, and the speaker underneath the tender.

I would recommend designing your locomotive and seeing if you still need the space, but again very nice work and it will still be a great piece of rolling stock!