I guess nothing is impossible, it would just take a lot of effort, which equates to cost. Part that you'll need include (at least):
*both headlight assemblies with projector lenses and inbuilt levelling motors
*levelling sensors front/rear with connector arms and brackets to chassis and suspension arms
*self-levelling controller? I figure something must exist for this
*fuses that fit into the underbonnet fuse housing; remove/replace incabin dash console (ie: no need for the manual headlight level dial)
The main difficultly I foresee is finding and running the wiring loom. I've no idea if any of it can plug-and-play with the existing looms. For example, wiring must run from the rear sensor, front sensor, to a controller, to the dash, through into the engine bay, and connect to the ballasts and headlight motors. You might want to strip the whole car to fit it neatly.
Maybe get yourself a copy of the workshop manual, and browse the wiring diagrams and descriptions, to see what is involved.