I have thought about doing that to the hood. Hood springs are around 10lb a set. Would work good with a glass hood where you would need to get lighter weight springs for it any way so you don't crack the glass hood with the stockers. So may as well take them off and go to a junk yard and pull a prop rod off of a newer car and shave even more weight. Could go even further at that point and drill some holes in the hinges.
Never thought about doing that to the trunk lid as the stock T bars are not that heavy.