Do you need it?
No.
Do you want it?
Yes.
Obviously you do or you would not even think about it let alone ask us here!
Be honest, you have already decided you do want it. If you have the money, space and time.....
....stop faffing around
....get the "Before" photos posted here
... do the work
....put the "After" photos up
...have fun!
Well go on then, GET ON WITH IT!
BTW, I think a Topo will easily fit in with average "Microcar" classification, so RUM register it (if not already) and enjoy a pre-war micro/mini which I reckon is probably quite rare in UK and will get a lot of attention.
One problem: once completed, your brother will want in on it!