TE Gemini...Quokka spec.
Welded diff....brake fluid in the washer resevoir...re route the lines for the washer nozzles into the carby. Will do awesome key bangers and will blow a shitload of thick white smoke when you activate the "washer nozzles".
Will cost you $650. Well under your 40k limit
You'll have heaps of money for fuel then...
...... Keep the rex