L135 is fine depending on how you wear it (I recommend losing the choker and adding a blouse.) p119 isn’t bad. The overlay isn’t great but it’s not terrible and it could work out if you coord it well. p193 is nice, I like that one a lot. I’m not at all a fan of p306 though and it doesn’t really strike me as something that I would see in Punk Lolita.
It depends on the shoes. Some of them are true to size and some run a little big. I would suggest looking for reviews on the specific shoes you’re looking for and if you can’t find any it’s probably best to just go with the actual measurement of your foot since many of them do tend to run a bit big.
The blouse could probably work but I would say no to the skirt. It’s very short and while it has a little volume it doesn’t look like it would hold a petticoat for a proper Lolita shape.
Just say “I’m not dressed up as anything, this is just how dress.” or “These are just normal clothes for me.” If they ask you to elaborate just say it’s a Japanese fashion. That’s usually enough for most people.
Give your exact measurements and they’ll be made to your measurements. Don’t add or subtract anything.
Who cares? It’s a great dress and you should get it if you want it. Don’t worry about it being popular or not.