Regarding professionalism: I inaccurately assumed that such an effort would not be known by all.
Regarding Financing: If they know their business (granted, often a bif "if"), they want to know if any 'unusual' circumstances do or will exist on the project, including during construction. Plans...
I concur with cvg... someone (you or the owner or the contractor or all 3) will pay for a redesign, whether it gets done or not... and may be paid for many times over if no redesign. You'll discover things during the redesign that you hadn't thought about... and will say "boy am I glad we found...
Most, or all, public utilites I have worked with do not allow laterals into manholes... my understanding is it is at least in part a hydraulic issue, as dicussed elsewhere.
However, the Navy at Pearl Harbor prefers laterals into manholes. It was surprise when I learned this. No one really had...