but there is not enough available wall space to accommodate a large surface-mounted or reccessed unit

If mounted above Seat

Bradley S04-065 Service Only-Access Panel Assy Replacement Part

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Nidec US Motors UN20T2BC Vector Duty Motor, 20 HP, 15.9 lb-in HP, Vector, 3600-1800 RPM, 230, 460V, 256TC Frame Capacity-12 oz but there is not enoughFeatures: 40 degree C ambient, 2000: 1 constant torque, Encoder & brake provisions Item: Vector Motor, Motor Type: Vector, HP: 20 HP, 15. 9 lb in, Nameplate RPM: 3600 1800, Voltage: 230 460, Frame: 256TC, Enclosure: Totally Enclosed, Rotation: CW CCW, Phase: 1, Insulation Class: F, Bearings: Ball, Base: Removable, Shaft Type: Key, Shaft Number: 1, Shaft Length: 4. 25", Shaft Height: 6. 25", Shaft Dia.: 1. 625", "C" Dim: 26. 3, Protection: Thermostat,