Bougainvillea

This bougainvillea was planted on builders rabble on the side of the house in the mid eighties. It was growing up to the top of the chimney.
I dug it up 6 years ago. There were big slabs under the roots, and as a result the roots were curled up. I planted it in a wooden training box.
It had no branches at all. I gradually reduced the root ball and planted it in a pot and I'm developing the branches. I have done extensive carving.

I'm thinking of removing the large surface root at the front and then it can go in a smaller proper bonsai pot but I haven't dared to do it yet as this
root has many fibrous roots growing from it's end.

I would welcome any suggestions.

Height 50 cm Trunk width 14 cm Age appr. 28 years

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Well Iam not sure about the curled base But Iam sure that I dont like the straight trunk..
Tree Inclination and reduction of height will probably give a spectacular result

Maybe pictures dont tell the right story...but the way i see it i would cut the top straight part off and take it from there..another interesting tree there.....