Fursuiter here. I make and perform in mine.
I love fursuits, but quad suits... well... they're a hard sell for me for many reasons.
Wearing a fullsuit with padding is very taxing, let alone being on all fours!
in 20 minutes I am TOAST inside my costume, and it's a standard digi suit.
As for the making, it requires exceptional skill. What makes or breaks a character is often the silhouette, and they tend to be godawful on the quads.
I only know of about 5 quad suits that look good. (Most made by Beastcub) The rest tend to look very bulky and strange.. and look exactly like a dude hunched over inside. You have to artificially lengthen the neck so it is no longer a mask but more of an armature.
I would definitely start with doing regular fursuits first! There are plenty of tutorials on Youtube to help you.. And you can shoot me a message too if you need