Use 2 x G9 ceramic insert you buy https://www.ebay.co.uk/itm/387114734578. I used silicon to glue cord to the stand and to glue bulb mount to the stand.
Rocket- any translucent filament vase mode 1mm extrusion width and variable layer height
centre box- ABS for extra heat resistance
Flames- orange transparent pla 15% gyroid infil
Cloud- transparent PETG or PLA ( fuzzy skin looks good) 5% gyroid infill
The author remixed this model.
Saturn v stand:
elongated both flames and clouds to scale for rocket, cut off bottom of flames for better light transmission.
Rocket ship:
clustered 5 nozzles together to fit flames and produce a reflection box and room for bulb