Nice work.
You could also follow up with some 80 grit sanding rolls to finish the blend.
About the thermostat housing, CSR has one. Big money @ around $100. Sounds expensive, but for the work to make one and the quality of work, its a bargin really.
CSR Performance Products | Cooling Accessoriess | Simply the Best
That link will get you close, then go to "360 swivel thermostats", then "ford".
