Oh yeah. Halcyon did have quite the range. I've done a lot of research on their Kenner based item and have a thorough grasp on its history now. That goes for all the weird Tsukuda stuff as well. That old mould was pimped about several times between 1984 and 1987.
Here's my findings regarding dates and publishing details on the relevant items:
• 1984, Tsukuda Hobby, Alien Jumbo Figure Series. No. 2, No. JF-02-6000
• 1991, Halcyon, Alien vinyl kit, No. HT01
• 1995, Tsukuda Hobby, Alien PVC complete model, No. SVM-29-7000
• 1997, Tsukuda Hobby, Alien PVC Complete model, No. SVM-29S-8500
-Windebieste.