How do I make a sculpture using rice crispie treats. I know how to make them and that some people crush them to make them smoother. What do I do then, shape them with a knife, mould them by hand? Do I need to put in supports for a structure between 6 - 8" tall? How do I cover the structure prior to icing? I am in England, we dont have candy melts or commercially produced rice krispie treats but can buy rice crispies and marshmallows.
Will melted chocolate be OK to cover? Can I cover the structure in fondant icing? These techniques that seem common on this site are not so common in Britain so I'm sorry if I am asking obvious questions.

I only used the RKT once, for the top of my mushroom house on the fairy cake. I shaped them while still warm, I then covered them with a light coat of BC and then applied the fondant. It worked great and stayed in place and everyone loved eating the RKT. I have seen on the Food Network challenge them covering the RKT in moldeling chocolate. I haven't tried that yet though. Good luck!

i also have a looot of questions about rkt.
Last week i made a mickey mouse cake, and i use rkt for the head, it was my firts time using rkt....I crushed rk before mix them in the marshmallows, to make it smooth(right or wrong?) i worked with rkt when still warm but they doesn't get hard, they were always soft (why?)
Maybe is because of the crushed rice krispies....i don't know.But i was like waiting for them to get hard.......that doesnt happen.
I put a thin layer of bc before fondant, not too much.For the ears i just put a little bit of water before fondant.I think water was better than bc......
finally i put the head on the cake with a dowel and it works just fine, i dont know if this is the right way to work with rkt, but here is the result.....
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1293592

Please rkt experts, come and help us!

Thanks to both of you for your comments and sharing your experiences. I have been waiting for a book from Amazon for 5 weeks on Cake cartooning but it hasn't arrived yet! The cake has to be ready for Thursday and I am going to have to wing it like you have done. I know there are lots of CCers out there who use RCT in this way but they dont seem to have read this post.

I've never worked w/the stuff myself but the other day I saw an old challenge on FoodNetwork. One gal wasmaking an animal w/it. She had molded it in a flower pot looking container; removed & carved a bit w/a knife. They she worked it w/her hands befor covering it w/fondant.
Of course, they only show a few brief seconds of this work but thought the info ,might help you.

Thanks for your help kakeladi, I wonder if I can get on to food network and see it

meliais, thatnks for your pm. Ive tries to reply with a pm twice tonight but something is preventing it from happening, anyway, thanks for replying. I'll watch your gallery photos as they come in.