Assuming that whatever happened to your motherboard did not at the same time corrupt the data on the HD array, in principle what you are suggesting could work. I think you are right to try to duplicate the old system as closely as possible, but even so IMHO the process will be very 'iffy'. Essentially the repaired system will have to work correctly first time - I take it that the OS was also located on the array - with no opportunity for adjustments etc.
The only way I can think of to improve the odds of success would be to set up the RAID0 array as a data slave ie booting from another disk and configuring the array separately. If you avoid writing to the array at any time, it should not be possible to corrupt the data on it. It would be more expensive and time-consuming than the straightforward method you suggest, but less so than sending it all to a data recovery specialist.