Ideally slaw you would find a used Shelf, or two, or even better a Source Shelf. If you are unsure a simple proof of concept will remove all doubt. Simply drill a hole or two to mount a bearing, add arm and motor, see how it sounds. I bet even without being careful, just slapping a motor on, piece of wood or MDF for the arm board, hardly even trying you will still be hearing a deep dark noise floor and more inner detail than ever. I mean it just kills it in terms of dropping the noise floor.
This way if for any reason you don't want to go on well you still have a Shelf only with a hole in it but still perfectly good for sitting components on. But that won't happen. You will want to go on.
If you look at mine one of the top images shows the Miller Carbon sitting on a Source Shelf. https://www.theanalogdept.com/c_miller.htm The table itself was all built from one Source Shelf. The plinth was cut out of a Shelf much like it looks in the photo. The left corner was then cut into a 5" diameter circle to be used for the nut that screws onto the bearing. Scroll down the page to a side view to see this. The right corner was cut into a smaller 3" circle to make the tone arm mount. Those Things and Cones thread right into the plinth.
This is all based on a modification of Chris Brady's Teres turntable. http://www.teresaudio.com/fame/index.html Chris no longer makes the tables but he used an arm board so you could run virtually any length arm. https://www.usaudiomart.com/details/649452242-teres-255-baltic-birch-turntable-with-signature-motor-... Mine goes for maximum strength and stability by making the sides more curved and using a solid arm base instead of the board. Either way works fine it just depends on what you want.
Every time I go back to that site it reminds me how long I've had my table. More than 16 years now!
This way if for any reason you don't want to go on well you still have a Shelf only with a hole in it but still perfectly good for sitting components on. But that won't happen. You will want to go on.
If you look at mine one of the top images shows the Miller Carbon sitting on a Source Shelf. https://www.theanalogdept.com/c_miller.htm The table itself was all built from one Source Shelf. The plinth was cut out of a Shelf much like it looks in the photo. The left corner was then cut into a 5" diameter circle to be used for the nut that screws onto the bearing. Scroll down the page to a side view to see this. The right corner was cut into a smaller 3" circle to make the tone arm mount. Those Things and Cones thread right into the plinth.
This is all based on a modification of Chris Brady's Teres turntable. http://www.teresaudio.com/fame/index.html Chris no longer makes the tables but he used an arm board so you could run virtually any length arm. https://www.usaudiomart.com/details/649452242-teres-255-baltic-birch-turntable-with-signature-motor-... Mine goes for maximum strength and stability by making the sides more curved and using a solid arm base instead of the board. Either way works fine it just depends on what you want.
Every time I go back to that site it reminds me how long I've had my table. More than 16 years now!