Yes it does come with a blank cover attached.
2 legs or 1ph 240V upto 70A
yes, and not quite sure of the "Hart-Lock..."
GE does make a 30A GFCI breaker THQL1130GFTP and would be compatible. You may not find it at HD however. Try your local GE supplier, ie. Cresent Electrical Supplies.
outside nema 3R rating. NEC table 310.15(B)(16) states that 70A would need a # 6 CU with a 90 degree Celsius rated outer cover.
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It has 1/2 ans 3/4 knockouts and space for a second 20 amp breaker
not for shure but dont think so,think the lugs in the box are to small the best i remember.