Hi -- cool (I mean Hott) idea -- and welcome to EM.
First, I would make sure that you've done your research on the ideal temperature. I've experimented with WAIs, HAIs, and CAIs for the last 3 years. For my Honda-based engine, the target is 100F.
I commend you on the design, but perhaps a simple tube to the exhaust manifold area could yield excellent results.
My WAI this Winter was essentially a 3-foot section of flex-pipe exhaust tubing, with the air source being just above the exhaust manifold. It was simple to install and relocate to source cooler air for Summer (which is essentially 90-100F as temps heat up). As ambient temps warmed up, congested traffic yielded 140-150F intake temps (which is bad -- the ECU dumps more fuel to cool the charge, and retards timing to prevent detonation).
Best FE to you and welcome to EM!
RH77