I'd hate to see the heater box cut too as it would destroy the stock look. Height seems to be the limiting factor. Was thinking if a deep indent blower could be used like the ARA unit, the motor could be recessed in quite a bit or maybe even a flat motor like the radiator fans use would work.
Vintage air also seems to have a fairly deep recess blower on some of their units if that could be obtained. The one in the drawing looks to be about 5 inches or so. Think the biggest issue would be the custom wheel enclosure to match up with the outlet. Being in the center kinda limits options so things might have to be mounted on a tilt. Using the outlet to feed the evaporator would allow fresh air or recirc just by use of the air vent control though.
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