Converting Knitting Patterns to Crochet, is it Possible?

I've been asked if it's possible to convert knitting patterns to crochet on occasion. Often it's a question coming from someone who wants to buy one of my patterns and make the conversion. Oddly, I've had two emails in the last two weeks asking this question about specific patterns. I've had to respond that since I don't crochet, I don't feel comfortable or competent answering this question. After I responded to this morning's query I thought it might be interesting to see what the Internet thinks. 

I started with Ravelry and found this thread right away by searching on convert knit to crochet in all forums. The answers were pretty much what I expected, one poster pointed out that the fabric created would be very different. Another suggested some patterns which looked similar to what the original poster was looking for. 

The Original: http://www.ravelry.com/patterns/library/prayer-shawl-in-skyp-stitch

The suggestion:http://www.ravelry.com/patterns/library/easy-cable-lace-stole

I did find this website which has some basic directions. When I read through, the person converting is basically redesigning the item using the original item as a pattern template. It does advise looking for a similar fabric type and to know the yarn required will increase. There was also a reference to a book on the topic. 
 

https://www.amazon.com/exec/obidos/ASIN/157367124X/ref=nosim/planetshoup-20

When I clicked over to Amazon, it also suggested two more books on the same topic. Have any of you ever done this?