Overall ratio 3:5. (48 x 80 units if you wish). Two stripes at fly together 1/8 of the hoist (H), i.e. 6 units. White stripe 1/5 of the blue, i.e. white 1 units, and blue 5 units (together 6 units as required above).

Blue disk in the center of the red field (NB! not in the center of the flag!) with diameter 1/2 H, i.e. 24 units. White ring surrounding it as wide as the white stripe at hoist, so outer diameter, 26 units.

Because the star dimensions are defined somewhat vaguely ("as closely as practicable without actually touching" each other or the white ring), the rest of the construction is also vague - and that is the main reason why the exact
figures cannot be given.

The star centers are not on a circle of half the diameter of the blue circle (that would give too much distance between their two "outer" rays and the white ring), but they should be on a circle with somewhat larger
diameter then half the blue diameter. One has to choose here - and my choice was to enlarge the "half the blue" diameter by 4%. The choice of this enlargement would make a slight difference to the result of the following numbers.

The triangle is inscribed in the virtual circle containing the star centers. The rotation of that triangle (from 0 degrees meaning one point at 12 o'clock), should be such that a line extended from one of its sides would intersect a vertical median of the flag (line connecting midpoints of the upper and lower edges of the flag) and the midpoint of the lower edge. This is the key requirement! The rotation to match this request for the diameter chosen above yields about 44.5 degrees. One may safely say that 45 degrees is a good approximation for practical purposes, I guess.

The result is the "nearest-dearest" star is tilted slightly towards hoist from the upwards position, and in fact all stars are turned so that none of the points point toward any vertex, nor is parallel with any flag edge, as was the
intention.

I used Old Glory Red (i.e. same as in the US flag) and somewhat lighter and a bit greyish blue, since it seems the Old Glory Blue is not used here.