Rick Dickinson, the designer for several machines sold by Sinclair in the 1980s, has died <http://www.theregister.co.uk/2018/04/26/rick_dickinson_dies/>. More recently, he was involved in the campaign to create the “ZX Spectrum Next” machine. Commenters have offered up some useful links: his Flickr gallery <https://www.flickr.com/photos/9574086(a)N02/albums> with some peeks at concept renders, and this item <https://www.youtube.com/watch?v=TAwHIcdidzI> from 2003 where he talks about his designs for Sinclair.