A good little ship! You should enjoy building it, as long as you can get past the '60s era fit.
I built the original issue back in the '70s.
I built a few of the UFO mystery ships in my time.
When R2 re released the UFO (2009?) I buit and lit it as the Leif.
I used aftermarket decals, and resin engine inserts.
I'm guessing yours is the R2/AMT Leif kit from around 2011ish?
I have that one in the stash. R2 put in the original stand and, as posted, swapped the grain-o-wheat bulbs to LEDs.
I'm guessing you have the Paragrafix PE set?
There used to be a resin upgrade kit also. I have it from decades ago, so I'm not sure if it
is still available.
It builds into a nice ship, it is also the inspiration for the I.S.S MacArthur from the novel "The Mote in Gods Eye"
Please post build photos! I would love to follow your build!