It is desirable to build two or three plastic models in parallel.

I believe it is desirable to build several plastic models in parallel—realistically, two or three at a time.This is because ...
nytimes.com

Shunsaku Tamiya, Who Brought Perfection to Plastic Models, Dies at 90

He turned his family’s lumber business into a manufacturer of model kits that won global popularity for their quality and historical accuracy. By Martin Fackler and Kiuko Notoya Reporting from Tokyo ...