Fill in the center section between the ports. There is no benefit to it other than an aesthetic. My first thought when I saw the pic was "I'm glad I'm not machining them"

Put a 6.5 mm fillet between the two tubes, It will save you and your prospective buyers some $$$. Machining out the centre is going to require small cutting tools and a longer cycle time

I designed something similar for SBM many years ago, just never got around to making them.