Just going off obvious missing items in pics, noninclusive of performing any parts refurbishment or restoration work. Math test:
$12k purchase for '60 MM landau endloader
$700 for a used windshield or $1k +/- new that doesn't fit well
$250 outer windshield stainless molding
$100 cowl vent
$150 wiper arms & wipers
$1k-$1200 for a dashboard
$200 for set of rollers & floor hardware
$350 landau irons & mounting hardware
$150 '59-'60 MM body molding (2)
$500+ IF locating a pair of '59-'60 MM sail panels (there are already at least two parties that have been looking a couple years already)
$250 driver fender
$200 skirts
-------
$16,350
-OR-
$2800 for a similar condition '60 MM landau 3-way
$700 for a used windshield or $1k +/- new that doesn't fit well
$1k-$1200 for a dashboard
$1k for a table
$500 rear loading door window
$400 rest of flat glass
$150 for correct front split seat core
-------
$6850
That's a savings of $9500 just from familiarizing yourself with what's available out there folks. Doesn't even take into consideration endloader's lump of earth being passed off as an engine while 3-way's engine turns.