Question: The Australian Lightwing SP-4000 Speed is designed and produced by Australian Lightwing of a town that lies on the Richmond River and serves as a gateway to what?

Context paragraphs:
The Richmond River Express Examiner: The Richmond River Express Examiner is a weekly newspaper published in Casino, New South Wales, Australia.  It has been previously published as "The Richmond River Express", "The Richmond River Express and Casino Kyogle Advertiser" and "The Richmond River Express and Tweed Advertiser".

Ballina, New South Wales: Ballina is a town in the Northern Rivers region of New South Wales, Australia, and the seat of the Ballina Shire local government area.  Ballina's urban population at the 2011 census was 15,963.  A larger area including Lennox Head had an estimated population of 25,194 at 30 June 2015.  The town lies on the Richmond River and serves as a gateway to Byron Bay.

Richmond River massacres: The Richmond River massacres were a series of murders of groups of Indigenous Australians and Europeans in the region around the Richmond River in north-eastern New South Wales in the mid-nineteenth century.

Australian Lightwing SP-2000 Speed: The Australian Lightwing SP-2000 Speed is an Australian light-sport aircraft, designed and produced by Australian Lightwing of Ballina, New South Wales.  The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.

Richmond River High School: Richmond River High School is a public high school located in North Lismore, New South Wales, Australia.  The school has a split site campus, featuring sporting grounds and agricultural plots that when combined with the rest of the grounds, cover over 26 hectares.  It also is affected by floods.  The Mission Statement of the school is "A Caring School of Excellence".  The Motto of Richmond River is "Knowledge Is Life".

Richmond River Light: Richmond River Light, also known as Ballina Head Light and Ballina Light, is an active lighthouse located at Ballina Head, a headland in Ballina, New South Wales, Australia.  The headland is at the northern side of the entrance to the Richmond River.  It used to serve to guide ships into the river port and is used also serves as a leading light into the river, together with a steamer's masthead lantern with a 200 mm lens which is raised on a wooden structure 30 m from it.

Australian Lightwing SP-4000 Speed: The Australian Lightwing SP-4000 Speed is an Australian kit aircraft, designed and produced by Australian Lightwing of Ballina, New South Wales.  The aircraft is supplied as a kit for amateur construction.

Richmond River cod: The Richmond River cod was a form of "Maccullochella" cod, now believed to have been eastern freshwater cod, "Maccullochella ikei", that occurred naturally in the Richmond River system, an east coast river system in north-east New South Wales, Australia.

Australian Lightwing GR 912: The Australian Lightwing GR 912 and Sport 2000 are a family of Australian light-sport aircraft, designed and produced by Australian Lightwing and introduced in 1986.  The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.

Australian Lightwing SP-6000: The Australian Lightwing SP-6000 (or SP6000) is an Australian kit aircraft under development by Australian Lightwing of Ballina, New South Wales.  The aircraft is intended to be supplied as a kit for amateur construction.

Supporting paragraphs: Australian Lightwing SP-4000 Speed Ballina, New South Wales
Answer: Byron Bay