ECM Computer Condrum

[Accelo]

I have transplanted an LS1 and had the original Corvette harness modified. I am now stuck with the wiring lengths unless I want to start over with a new custom replacement harness. If I would have planned better that would be my recommendation to anyone else. My question is where should I install the ECM? I have pictured the location that seems to work best for my wire lengths. The hood hinge doesn't interfere at all with this location. I will paint it to match the firewall, maybe that will help? I plan on installing the ODB connection in the glove box. Well, what is left of the box after installing the Vintage Air. Another option is to install the ECM under the passenger bucket seat. The is possible but the large hole that would be required to install it under the floor has me turned off. Those seem to be my best options without changing the harness.
Regrettably the existing wiring is too short to put it behind the headlights on the core support. I would much prefer it out of sight.
Maybe I have answered my own questions? Comments appreciated.
Rick