The following are pictures of universal covers of half-twist tight flute surfaces.
In [BHS], Hakobyan created the half-twist tight flute surfaces Xa,b with length parameters defined by:
l2n= alog(n+1)+blog(n) and l2n+1=(a+b)log(n+1).
Below are universal covers of Xa,b.

X4,1

X3.2,1.2

X5.7,1.8

X3.6,0.5

X1,4

X1.5,3.1

X4,1