With the realization that I do not know all of the specific facts, it does not appear as if you need to make a 645 election in the first place; all of the assets were held by the trust (which it is now apparent was a RLT and, hence qualified).
If there is no other reason to file a return for the estate, then you most likely only need to file a 1041 for the trust to include the income from the stock sales, interest, and legal expenses.
