Be careful with home made forks, you can put loads into the bucket for which it was not designed. Two risks: Worst, the attachment breaks unexpectedly, and drops your load and maybe recoils the loader/tractor. Or, you just bend the bucket. I have the proper JD dealer purchased forks for my 1025R, and I still managed to slightly bend the fork frame while lifting a too large log. You build a light arrangement, promising yourself that you'll only lift light loads, but then you lift something too heavy. Buying the proper fork attachment will be lest costly than breaking something unintended.
If you must, space the forks as wide as practical to spread the load away from the middle of the bucket, which is the least strong.