Dry lining a garage

I want to dry line a garage its only about 2.5 m x 3m. apex roof, all to be battened out, and filled with 25mm insulation between the rafters then plaster boarded over, walls drylined with thermal backed 25mm insulation board, with battens on the concrete floor slab with 25mm insulation between (I have battens and a dpm) plus weyroc flooring board. No plastering needed, happy with tape and joint, no decoration or wiring or glazing, skirting etc etc. thanks