I have not tried it, but I would suggest using the strawberry cake mix with this recipe:
http://www.cakecentral.com/cake_recipe-1972-Durable-Cake-for-3D-and-Wedding-Cakes.html
For all of my 3D cake mixes I simply add a box of pudding and an extra egg to my box mix ingredients and it makes a nice dense but moist cake to carve. For a strawberry cake I just use a white box mix, add vanilla pudding, extra egg, and a box of strawberry jello for the flavoring. YUM! HTH!
If you already have a strawberry box mix, than I would just add the vanilla pudding and the extra egg, the Strawberry jello was just to help if all you had was a white mix. If you want to add a better strawberry kick to your cake I would do it by adding strawberry preserves to the batter. HTH!
I've tried strawberry jello in cake mix and did not love the texture.
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