MAMEWorld Forums - MAME Artwork: Official

I'm in the process of adding working buttons to all of my files, and some of these have me stumped. The game in question at present is aliens. The only reference I can find in the driver source is thus:

PORT_START("DSW1")
KONAMI_COINAGE_LOC(DEF_STR( Free_Play ), "No Credits", SW1)
/* "No Credits" = both coin slots open, but no effect on coin counters */

PORT_START("DSW2")
PORT_DIPNAME( 0x03, 0x02, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW2:1,2")
PORT_DIPSETTING( 0x03, "1" )
PORT_DIPSETTING( 0x02, "2" )
PORT_DIPSETTING( 0x01, "3" )
PORT_DIPSETTING( 0x00, "5" )
PORT_DIPUNUSED_DIPLOC( 0x0004, 0x0004, "SW2:3" ) /* Listed as "Unused" */
PORT_DIPUNUSED_DIPLOC( 0x0008, 0x0008, "SW2:4" ) /* Listed as "Unused" */
PORT_DIPUNUSED_DIPLOC( 0x0010, 0x0010, "SW2:5" ) /* Listed as "Unused" */
PORT_DIPNAME( 0x60, 0x40, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW2:6,7")
PORT_DIPSETTING( 0x60, DEF_STR( Easy ) )
PORT_DIPSETTING( 0x40, DEF_STR( Normal ) )
PORT_DIPSETTING( 0x20, DEF_STR( Hard ) )
PORT_DIPSETTING( 0x00, DEF_STR( Very_Hard ) )
PORT_DIPNAME( 0x80, 0x00, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW2:8")
PORT_DIPSETTING( 0x80, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )

PORT_START("DSW3")
PORT_DIPNAME( 0x01, 0x01, DEF_STR( Flip_Screen ) ) PORT_DIPLOCATION("SW3:1")
PORT_DIPSETTING( 0x01, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
PORT_DIPUNUSED_DIPLOC( 0x02, 0x02, "SW3:2" ) /* Listed as "Unused" */
PORT_SERVICE_DIPLOC( 0x04, IP_ACTIVE_LOW, "SW3:3" )
PORT_DIPUNUSED_DIPLOC( 0x08, 0x08, "SW3:4" ) /* Listed as "Unused" */
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_SERVICE1 )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

PORT_START("P1")
KONAMI8_B12_COIN_START(1)

PORT_START("P2")
KONAMI8_B12_COIN_START(2)

From this, I can't determine what to put in the .lay file to get it to read the Player 1 start, Player 2 start, and buttons 1 and 2 for each player. The .cfg file wasn't much help either. Rather than ask how to find it for this particular game, since I'm going to be doing hundreds of these I'll ask instead what methodology you'd use to find it? Is there some kind of reverse hook app available?

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I have officially retired from sucking at everything I do. Life is much easier now.

My MAME/MESS artwork files: https://drive.google.com/open?id=1ABxeKgNIrKlIsyck7dx4V241NFQDWAF4
Related screen shots: https://drive.google.com/open?id=1U5IbvbVzYW97PuOOQuocvZFE_YJz7WIn