From experience with a Cessna Cardinal RG that was refurbished and tricked out with all the electronics. Just because it looks good does not mean it is good. The under carriage was out of alignment and the engine was not good yet over £100,000 pounds had been spent on purchase and fit out.
So sort the fundamentals before making it look good and adding electronics or it will be in/out of the shop forever.
If there is a type club join them before buying & learn all the problems, it will save thousands, then before purchase find an AP that actually knows the type in depth to do a survey, remember buyer beware it may be an uneconomic repair.