Unless you are very proficient at micro-controller programming and have a good bit of money to spend + good at power electronics and signal / dsp work, it would probably be better to buy one.
AC Motor drivers are -not- easy to make, especially when you are dealing with over 200V. (Gate drive and other things become an issue)
This is coming from someone who works in the servo drive industry (3 phase BLDC motors and BLAC motors + accurate control systems) We have been looking into developing our own but decided to outsource for now due to costs.
If you just want to make something as a hobby / for a bit of fun, I suggest starting off with a DC 4-quadrant motor driver, then move on towards a Switch mode power supply, maybe try making a PFC controller and then try making a low voltage 3 phase motor driver before moving up to high voltage, this would help you out and bring you along the tech tree.
DC motor driver - gives you a good grounding for understanding full bridge power systems.
Switch Mode - advances you as you have to look into higher frequency switching (20-100kHz) of a medium/high voltage bridge.
PFC - will advance you into looking at PWM and waveforms to simulate a sine wave (make the PFC using a microcontroller rather then A PFC chip.)
LV 3 phase motor driver - now try dealing with 3 half-bridges rather then just 2. Learn how to do the phasing and controls.
HV 3 phase motor driver - just add what you learned in making the switch mode (high voltage, higher frequency switching) to the LV 3 phase motor driver (mostly just changing the power stage here, maybe some additional safety features)
This is just my 2 cents! (I know not of how experienced you are already)
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