I see one of the local (NZ) LVL plants special order maximum size is 18.4 m x 1.220 m x 90mm. One of these would probadly keep the world in aircraft spar of 10 years (or let one build a 2:1 scale minicab).The use of the plant quality control would be nice for a special run for aircraft woods. Limit the splices to aircraft requirements. Glulam style with 8-15 ft pieces. Thicker laminate of the LVL. Spars are the no compromise part. Finding wood long enough Is becoming an issue no matter the budget. Use the process but aviation grade.