For What It is Worth:
Before committing to any size router table/router cabinet, carefully think about what you would like to do and available space. An internet search for constructing a router table/cabinet will yield a mind boggling number of web pages/links, threads, videos, etc.
As a self-professed neophyte, suggest purchasing books. I find that often times a book is a handier and faster reference than an internet search. Bill Hylton authored several router books and I recommend them. Some might be at your local library or a well-stocked book store. I purchase most from used book dealers such as AbeBooks or Alibris. See:
https://www.abebooks.com and
Alibris - Buy new and used books, textbooks, music and movies
Back-In-the-Day, I started with my ol’ tried and true PC 690 router mounted to a piece a ¾” plyw’d (about 12 x 18”, clamped to my bench. fence was a 1X3 piece of hardwood, clamped in place where neeed. Adjustments made by loosening a clamp and the ever-present Fine Adjusting Tool (tack hammer). After seeing Bob and Rick Rosendahl’s demonstration at a 1990’s wood show, I purchased their now no longer available Oak Park Router table which served me very well. Very compact; light weight.
Then I told myself that I just needed a New Yankee Workshop ACFDS router cabinet (aircraft carrier flight deck size). Flash forward ‘bout fifteen years: after using this table (approximately 24 X 32”), I
realized for the work I do the table is too big and a “catch all” when not in us, cabinet takes up needed floor space, etc.
Now I am back to Square One. Build a smaller table with an approximately 16 x 24” top and a stout box for the bits. Two piece cabinet. Separable upper for router and top if needed to transport, etc. Lower compartment for the bit box. Since it will be small and lighter weight, do not think that 4 or 5” casters will needed. Something akin the Harbor Fright (Harbor Freight to the initiated) hopefully will work. See:
300 Lb. Capacity Mobile Base
Earlier, I posted this link to a compact, can be clamped to workbench router table:
One-weekend Router Table - Popular Woodworking Magazine