This is an interesting turn up for the books! A Sci-fi diorama in 1/144!
This is made by the same people who bought the cool sdkfz 251 and KarlMorser etc!!!
Comes in Model kit form (1/144 scale)
#9002 War Machines Attack model kit (Base 8" long)$19.99
1/72 Area 51 UFO AE-341.15B model kit (8.25" Dia)
This is 1/72, but at 8.5 Inches, i think you might get away with putting this up against a Anigrand or Unicraft Hanebau???? the model whilst interesting doesnt give to many clues as to a natural scale? It would be much larger than the WOTW Martians...
other 1/144 UFO
1/87 Busch Gmbh UFO Diorama (out of production)
Although designed for HO railways, the bush documents also make a bid for N (1/160) & TT (1/120) dioramas. The model is @6 Inches and included 14volt electronics for lighting etc.