Don’t be afraid of round or even more complicated. I first caught sight of the one you did not make and started thinking of how you could do that in wood and acrylic. I particularly like the solid wood with cherry blossoms. Is that the tigerwood? It looks very similar to zebrawood which I found to be very flammable.
As one who has struggled to get the exhaust working the very concept of a brick exhaust port is mind-bending 