There are few other things I've done that I'd not realised were not posted here:
What use could this be?
With the brutal use of oxy-acetylene
then an angle grinder to this
and then cleaned up on a lathe:
Three of these made a spare wheel support braket to bolt to my GRP boot lid -two to sandwich either side the GRP for strength, then a spacer, and this one on top for the spare to attach to.
Although it is robust there were two problems - brake discs are made to wear from a cast steel which can not be welded, so the spacer had to be bolted between the layers.
And the second? - its b***dy heavy!