!st thing that i notice in the picture is the open cone filter sitting behind the radiator & intercooler, without a heatshield or a cool air feed (not as effective as a fully encapsulated filter/ intet anyway)

isolating the intake air from the underbonnet heat/ heat generated by the IC/ radiator by fitting a BMC or venom etc fully encapsulated filter/ inlet (if there is enough space!) or a bonnet scoop etc, would reduce inlet temps in the 1st place,

I also found an intercooler waterspray allowed me to use a smaller, lighter IC, with a smaller internal volume and a lower profile (sitting inder the bumper/ not being "masked" by the bumper - not a problem you have!) although the lower mass of metal (of the realatively smaller IC) means the IC heats up quicker, it looses its heat/ cools down quicker too (lower thermal inertia) the lower internal volume reduces lag/ boosts bottom end power/ torque (realative to a larger IC) but the external waterspray increases the cooling efficiency of the smaller IC, (massively, due to the latent heat of evaporation) so it has the cooling ifficiency/ top end power of a larger IC, but without the larger internal volume/ lag of a larger one

The external waterspray is "safe" and will not destroy/ chew up your sompressor wheel like pre-turbo water injection may, no problems with atomisation and you won't need to have a spare compressor wheel/ turbo handy

What im saying is better to get a proper insulated CAIS and an external intercooler waterspray 1st, (easier to impliment, less drawbacks) then after that consider water injection, as a total overall thermal management system

You will probably have done the same research as i have done, i considered using a 2-stage electronic boost controller, with the 1st stage set up for without water injection, and the 2dd stage with (so they cold be optimised for with without WI) with some sort of warning/ fail safe for if/ when the liquid runs out to switch it to the lower boost (this would depend on the type/ sophisticatin of the WI system used)

You don't mention your intended use for the car, or how big a container you will need, you may not have enough space under the bonnet if a larger tank is required, passenger footwell? - right at the back for better traction?