Funny you mentioned that, because in the Facebook car modelling groups I am in, kids are turning out great works on Hondas and Toyotas, works that can rival many builds in here. Especially with the Revell Honda kits that people keep saying Revell couldn't give away. They are not just building them straight out of the box but also parting them out to swap the engine and mechanical into other curbside kits. There are definitely young people building models, they are just not hanging out in the typical forums or LHS. Many of them are attracted to Facebook groups where they can share their builds and talk about model cars with people all over the world. No memes, no flames, and no lectures on how lame a particular genre or build style is.
The rest of the series are 2 variations of the Fujiwara Trueno, one with the pop-up lights down and the other with them up. http://www.1999.co.jp/eng/search?typ1_c=112&cat=car&sold=0&state=0&sortid=0&target=series&searchkey=Initial+D+(Aoshima) They were first tooled up in the late 90's, when the Initial D manga series started to become popular.
Internet shopping is so prevalent in China that many shops have turned online only. Have you tried TaoBao (www.taobao.com)? There are quite a lot of stores that are selling model kits and paints. I have personally bought from T7 Hobby and I am very happy with their services. Just pick shops that have been in business for a fair bit of time.
I highly doubt that was the case. At the beginning, way before Tamiya entered the smaller scale car model market, the competing scales were 1/28, 1/24, 1/21 and 1/20 among the Japanese kit makers. 1/28 and 1/21 soon fell out of favour, leaving the market divided between 1/24 and 1/20 (although it did not stop the manufacturers from rebranding their 1/28 kit as 1/24, especially after mergers and buyout of molds from bankrupted kit makers).
By the 80's the market has pretty much settled on 1/24, with LS and Bandai as the last holdouts for 1/20. After Bandai stopped making model cars and LS went out of business in the early 90's, 1/20 finally died off as the general car model scale in Japan.
Tamiya started out with 1/12 for their detailed car kits, and scaled down to 1/20 in 1977 with the Tyrell P34, and to 1/24 in 1978 with the Porsche 935. By that time the Japanese market had already settled on 1/24 and 1/20, and I don't think there would be any Monogram influence that late in the game.