Stegadon Conversions

So I'm planning a very ambitious Stegadon conversion, a zombie Stegadon for a Vampire Counts pact force for Storm of Magic and make a Mazdamundi. Before I do something really awesome and challenging, I need to do something kind of awesome and relatively easy

I was thinking Stegadons not trained form combat. I was planning on using magnets for Howdahs since Stegadons and Howdahs separately. So I thought maybe making a howdah substitute to represent a pack Stegadon. I know it would only be useable in special scenarios but the idea won't leave my head and I think iit might look cool.

So do you think skinks would attached a bunch of sacks, a giant box, or what for Steggy beasts of burden?

The second thought I had was substituting a Stegadon for a battering ram for siege scenarios. They only move forward and bash things like the battering ram and can't fight. I figure instead of putting the crew on a howdah, the crew would follow with poking sticks like a Salamander team. I'm not sure what to change on the Stegadon for a "battering ram" though. A giant helmet maybe?

Hopefully something reversible so it can be converted back inot a regular Stegadon, I'm not made of money, I'd prefer to not have to use a Stegadon kit entirely for my training wheel conversions if possible.