No one likes to go a doctors clinic but these small clinics are part of Americana. You won't find an available kit, so here is a set of sketches for scratch building one. The footprint is 2" x 4" and is a relatively easy build.
Choice of materials is up to you. One of the overview sketches shows a brick version. To do the brick version use .040 plain styrene for the walls instead of siding. For brick sheets I recommend Rslaserkits #3704.
The building directions are in the sketches, and to make your build easier you can enlarge them to full size and print them out. Read directions in assembly sketches before cutting out parts as you may want to change some sizes or cut fewer, or additional, openings.
Included sketches are: Overview sketch, Parts templates, Assembly sketches, and PDF’s.
To print the part templates actual size, use the PDF's. Select best printer quality, set PDF zoom to 100%, and page scaling to "none" or actual size. Check your printed page to see that 3" lines are exactly 3" long. Once you have template printed, you can cut with scissors (leave a 1/8" border) and arrange on your material for maximum sheet usage. Part templates for siding are a mirror image, when needed, so that you can cut walls with siding side down (easier to cut). Be sure siding grooves are oriented correctly. Use rubber cement or Krylon Easy Tack Repositionable Adhesive to glue paper templates to your material and then just cut on lines. No measuring ! Paper comes off easily.
Follow directions in assembly sketches.
PDF links:
https://www.dropbox.com/s/mfea4t3jox1vkb3/ndclpt1pdf.pdfhttps://www.dropbox.com/s/i2ln9089pplz7tb/ndclpt2pdf.pdfhttps://www.dropbox.com/s/0ck3tolnk4bsiqw/ndclpt3pdf.pdf