Like in Construction work, the more hands on a project the sooner to completion, many members of team with a range of skill often apprentice level means a supervisor is needed. Hopefully this is owner/pilot, quality work takes time, please take your time some of this IS rocket science...
Im on a three year plan to fly, 6 months to study and prepare, this is focused on modifications also differences between the three models. I will build two engines from parts on hand, scrounging is a big part of it here. i have three older snowmobiles im considering their engines too, although the best HP is water cooled(weight??)
my residential garage is my shop, has heat for the winter months and good ventilation for the fumes of welding and covering (in the summer).
Ventilation is a must, use it for welding epoxy sanding and covering (dope is death). Use a high output shop vac with large funnel, i found an old whole house canister that i mounted on the exterior, easy to use.