Aligned stack variables MASM 64-bit

.code
main PROC
	main_locs STRUC QWORD			; 8 byte (QWORD) alignment
		beginStack DQ ?
		myLocalA   DQ ?
		myLocalB   DQ ?
		myArrayA   BYTE 10 DUP (?)
		myArrayB   BYTE 10 DUP (?)
		endStack   DQ ?
	main_locs ENDS
	LOCAL stack_vars: main_locs

	lea rcx, stack_vars
	mov [rcx][main_locs.beginStack], 0ffffffffdeadbeefh
	mov [rcx][main_locs.myLocalA],   0ffffffffffffffffh
	mov [rcx][main_locs.myLocalB],   00000000000000000h
	;Fill myArrayA with 10 As
	mov rax, "AAAAAAAA"
	mov QWORD PTR[rcx][main_locs.myArrayA], rax
	mov WORD  PTR[rcx][main_locs.myArrayA+8], ax
	;Fill myArrayB with 10 Bs
	mov rax, "BBBBBBBB"
	mov QWORD PTR[rcx][main_locs.myArrayB], rax
	mov WORD  PTR[rcx][main_locs.myArrayB+8], ax
	mov [rcx][main_locs.endStack], 0ffffffffbaadf00dh
	ret
main ENDP

end