I researched doing my own and the experimentation factor is pretty high.
I bought the upgrade and am going to install it soon. I work weekends so my free time hasn't been much lately.
I would suggest you re-consider and go with something that was tested extensively and well documented. Sometimes spending a little more saves you a lot of troubleshooting later
It's a lot of work to create your own. The one from Ultimaker is amazing because it completely rebuilds the platform which was the weakest part - before the upgrade I was releveling between every print. Now I can level once and a month later it's still fine even after removing the glass and putting it back in. Even after wacking pretty hard to get prints off the bed when they stick extra well.
It's a huge improvement that you wont get with just the heat part.
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