I think the best available G8A three side view drawing is in page 170 of "FRENCH SECRET PROJECTS Post War Fighter" J.C.Carbonel, because it's seems to be a official drawing.
And in page 192/193 of "Le Mirage F1 et les MIRAGES de seconde génération, voilure en fleche par Michel Liebert st Sébastien Buyck Premier tome: Projets et Prototypes".
Mirage G was developed into a twin-engine, two-seat nuclear strike fighter, the Mirage G4. G4 was intended to be powered by Snecma M53 turbofan engines.
While two G4 were under construction the requirements changed and the French military requested that the design be converted into a dedicated interceptor, the Mirage G8.
Mirage G4-01 was redesignated G8-01 and remained a two-seat aircraft (first flight 8 May 1971) with the second aircraft, G4-02 becoming a single-seat version, G8-02 (first flight 13 July 1972).
But no funding was included for the Mirage G8 in the 1971-1976 French defence budget the aircraft did not enter production.
Among G family, only G, G8-01 and G8-02 realized.
“Mirage G8 02 made its maiden flight at Istres, on July 13, 1972, piloted by Jean-Marie Saget. For its first anniversary – and its 74th sortie – on July 13, 1973, it achieved the highest speed ever for an aircraft in Western Europe: Mach 2.34 at 42,000 ft.”