When I build wheels at home I don't use a stand but instead a long dowel rubber-band'd around the stays or fork legs. Works for both radial and lateral.
As far as the actual truing; I find this process much easier and faster than conventional truing during the build. I build a dozen or so wheels a year and using this method I don't have to address radial true at all after the initial adjustments.
https://wheelfanatyk.com/blogs/blog/...-right-to-left
...Step 1, begin by lacing your wheel in the normal fashion. Make sure each nipple is loose but tightened down the same distance as its same side neighbors. Step 2, now tighten your drive (right) side nipples evenly until they become snug. Continue until this side becomes tight, about 2/3 of finished tension. Make sure left side spokes are still loose.
Whoa, you may say, "the rim is now centered over the right hub flange and does not run true." Yes, but no worry, this is exactly what you want. The rim will wobble all over the place since there's no triangulation yet working. Open your truing stand indicators so the wheel can be rotated. Step 3, improve roundness (radial runout) by tightening and loosening drive side nipples ONLY...