If boards are just laminated face grain to face grain I only use plugs top and bottom .
When using segments , the glue surfaces are partially face grain and partially end grain because of the angle they are cut on . I usually (but not always) put a solid foot on the underside of segmented bowls because if I posted pictures of bowls without a solid piece over the segments , on a couple sites , a few members would throw a hairy fit and tell me it is going to self destruct and split and warp and crack and all kinds of other scary things due to wood 'movement' .
With that said, I have glued up segmented pieces for the last 20 years without a solid piece covering them and never had a problem .
They are right if not using properly cured wood or using a poor grade of glue or not applying a good finish or if subjecting the bowl to extremes of hot or cold or too dry or two damp . .
But . . . . with properly cured wood and Titebond 111 glue and a couple applications of shellac sealer and a few coats of a good hard film finish , I don't believe anything is going to self destruct in most peoples lifetime .
Oh . . about the dog house :biggrin:
I moved from the mountainside 14 km away to a smaller house in town. No room in the basement even after a huge downsize in everything . Back yard can only have buildings on certain areas due to services lines below . To build a bigger shop than 10 x 10 requires a building permit with inspectors breathing down my neck every step of the way . No permit or extra taxes for 10 x 10 on skids and I built it all to code anyway . . Will be very easy to heat with the little 750/1500 watt cube heater you might have noticed sitting on the scroll saw table in the video . Getting along quite nicely with my 90 square feet of space . Very easy to keep clean .