There were seven "Iwo Jima" class LPHs built, (Iwo Jima, Okinawa, Guadalcanal,
Guam, Tripoli, New Orleans, and Inchon) between 1959 and 1970.
Aurora released a kit of the Guadalcanal in the 1960s in 1/600th scale, now the
kit normally goes for $100+ on eBay.
Waveline has the Iwo Jima (out of stock) and Okinawa in 1/700th scale for
$64.99 and $59.99 respectively.
LPHs were just under 592' long and 84' wide with a draft of 26', they displaced
up to 18,300 tons with a max speed of 20 knots. (though when I was on them they
never did more than about 12 or 15 knots)
LHAs are somewhat larger with a length approaching that of WWII Essex Class
carriers and can handle more aircraft as well as amphibous craft.