This is my first visit to the new website, very nice.  On the MOA forum, under Airheads, a feller got a gift that may be of interest to some here.  The gift was a one-half scale R90S model.  This is currently (23 Dec 2020) available from Amazon - 

https://www.amazon.com/gp/product/B07LDC9MJW/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

There is a fairly detailed video on YouTube demonstrating assembly of the model - 

https://www.youtube.com/watch?v=6f0Hx-kCR0c&feature=youtu.be

I ordered my model.  Having worked on "real" boxer motors and transmissions, I wonder if I will be at an advantage or disadvantage in assembling this model?  🙂

Be safe and have a happy new year!!