[aerogreen]

While initially crude on instrumentation the airplane engines and propellers will make it big and powerful.
Will elaborate more on technical stuff later.

Even tough its a non-profit organization, a "business" plan is the first step.

Being non-profit the aim of the wind tunnel is to charge only running costs like engine fuel, smoke chemicals and lighting electricity bills.

All test data and results will be made public as a contribution to mankind.
Youtube videos come to mind to keep web hosting costs low.
Although if possible the tunnel may also charge extra dollars for closed doors testing where results are released only to the customers. For example small car racing teams may choose to use this private service as not to be copied and surpassed. This extra income must be reinvested in equipment and facilities.

Customers will need to send the model by UPS or some similar company, prepaying for return if they want their model sent back after testing.
Model mounts and attached points will need to be standarized.

Green research will be given the highest priority for example zero or low emission vehicles, solar concentrators, heliostats and solar panel arrays and green buidings.

The tunnel may charge some extra (small) fees for model building, placing tufts, oil or evaporating chemicals on the model surface.
Minimum wage in that country is a bit less than $300/month for a workweek of fourty-something hours. Minimum wage isn't defined by hour in that country.

The tunnel is open to donations and to keep them honest only low wages will be paid to its employees. Low wage employees will do easy repetitive labor like sanding and gluing models, attaching tufts, cleaning, maintenance.
At least one highly knowledgeable aerodynamicist/manager will need to be hired. It must be discussed if higher wages can be paid for the manager or if his salary must come from a separate donation.