This kit is as old as the hills, & a bit optimistic as to accuracy, as in a bit short(?), but can be made into a fine kit.
SFAIK, The UDT designation is post-war, but this was used WW2 & up to Vietnam(?) as well.
I have seen a build log where someone accurised it, but can't remember where I saw it, & another where a 'hard-top' variant was used on D-Day.
The Lindberg LCVP would be a fine addition to the bathtub navy it being motorised, & is almost the same size as the Italeri, with differences, but that's ok as more than one boat-yard & furniture company made them.
If you want more recent Italeri's LCM3 & LCVP are very good kits.
If you want pain, Fonderie Minitures did a LCA, reasonably accurate in profile, but made from crumbly cheese not plastic!
I don't know if the Canadians used this boat though, Good luck