Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

The Alpha Legion, especially the untainted renegade ones, aren't exactly the type to use massive daemonic siege engines like Forgefiends.

Perhaps you could run them with the loyalist space marine codex and simply use some of the big mechs they have at their disposal.

You could paint the forgefiends the colours of another legion and pretend your Alpha Legionaries were helping your opponent fight them until you stabbed them in the back, Isstvaan 5 style.

You could shave off all the spikes and Chaos stars and make the fleshy parts look more mechanical so they simply look like some obscure Mechanicum robots.