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So, I'm not going to lie, I'm not a big fan of infantry-based heavy weapons. That said, I've been finding a need for them recently, so I decided to dust off an old design for a gun chassis. Basically, long ago, I wanted to have a way of making interchangeable weapons that were based on a tripod (so, the lascannon, autocannon and heavy bolter) and so came up with a way of doing a gun chassis that looked cooler than either the old GW ones or, well, the tripod. I only made one then, but decided to mass produce a big batch of them when I wanted to include some autocannon heavy weapons team.

The gun chassis start with a trip to the hardware store to get some wheels. There are lots of possible options, the important thing is to pick one and then stick with it.

The first step is to break the "wheels" out of the package and cut out a chunk of sprue of appropriate length to serve as the axle (or whatever else you want for the axle). You can make the axle out of a variety of things, but I like sprue chunks because they're beefy, and, well, what else are you doing with those empty sprues?

Then jam in the axle to one of the wheels. I used greenstuff to really anchor that sucker in. Of course, you have to make sure that it sticks straight up perpendicular to the wheel. Also, if you're going to want to mount anything to the wheels, make sure that the angle on the metal hex part are both pointing in the same direction, for example, the top is parallel to the ground.

Once that's cured, you do the same thing with the other side. As the side that was already done will be heavy, you sort of have to squish in the other wheel from the top. When things start to cure a bit, you may want to GENTLY roll the wheels back and forth to see if the wheels wobble due to not being perpendicular to the axle.

Now, the heavy weapons come with these convenient pins that fit into the tripods, so it just makes sense to use the tripods. Start by chopping off the front leg.

And then glue/GS it onto the axle.

Then it's just a matter of cleaning things up. Especially GSing over the screw holes in the wheels.

Of course, you could be done with it here, but I like to spruce it up. I usually put down a couple of platforms on the side, a winged skull from the vehicle sprue on the front, along with some other bitz.

Then cut off the heavy weapons of choice. Note how conveniently it fits in.

Then you just have to paint it all up.

Then all you've got to do is take out one of your loaders and big bases. That and make a gunner.

Put them all together, and you've got some heavy weapons teams to put down the hurt on the enemy!

The best part is that all you've got to do is paint up the heavy weapons, and they just plug into the gun chassis. A good-looking, low-effort way to make swappable heavy weapons.