[jhester6]

You would likely have an exceedingly hard time getting that sort of output using WiFi. The real issue is resolution (your ability to isolate your target from nearby reflectors) which, in range, is determined by your usable bandwidth. In the best case, with the 1.2 GHz (ish) supplied by WiFI-6, your resolution would be c/(2B) = 12.5 cm (with c being the celerity of light). Then, you would have to measure from at least three different locations to get a 3D image with sufficient resolution.

An alternative approach would be to use holographic principles, but these require you to measure very accurately the position of your transmitters, whether you use a multiplicity of them placed in different locations or employ Synthetic Aperture Radar methods with a single one (by moving your transmitter).

That is why using 60 Ghz radars (with 4 GHz of bandwidth and Angle of Arrival capabilities) at short ranges would probably be the most promising direction. You can get a dev kit for one of these from Texas Instruments or some other supplier for not too much money.