Welcome friend
I have run the bow and Engine variant on mine (magnetized). The engine is best when you have a Slann. It gives you an additional Cosmic die that you get to roll and discard lowest. The bow was OK. I used it against Daughters of Khaine as a why not and I found it's a little unreliable. A bastilidon is preferred if you're going ranged.
A few fun tips for using the steg:
- Try and get the charge with it for the bonus to crushing stomps.
- Stegadon with fire throwers are really good ontop of objectives. If you can teleport it or simply get it to an objective, charge in, and next turn, use the fire. You'll melt the enemy.
- They are a decent summon later game because of the point above, but because they'll be outside of shooting range so you may want to opt for bow at that point.
- Don't forget to roll for your skink javelins!
Edit:
- Teleport your stegadon near an objective. LoSaT happen during the hero phase and you can use the skink alpha ability to get an immediate move closer to the objective (even if you roll a 3-4, because the immediate move happens in the hero phase and doesn't count as your move action for the movement phase).. which will put you in range with your flame throwers... and make it easier for a charge. Yeah. I'm doing this next game.
- Skink alpha ability can be used on the Stegadon itself as well as Terradons, Rippers, Troglodons, Bastilidons, etc, because they have the SKINK/SKINKS keyword. A FAQ clarified that SKINK and SKINKS are synonymous.
- Kroxigors benefit from the SKINK keytag on the Stegadon.