Thanks Andy!

. James had also asked about a roof, so you're in good company

Yeah, a mesh roof would look cool but practically speaking I think I'd have to raise the roof line to get minis in and out..... it's a fast insertion vehicle rather than a distance transit so I'm not 'too' worried about a roof from the utility perspective and a higher roofline might spoil the sleek aesthetic. Ponder. Ponder. Ponder.....
I did do a bit of pondering. I suppose that while it has helicopter functionality, I'm also influenced by other fast insertion craft such RIBs, especially as without a rotor it doesn't actually have a mechanical need for a roof. I was considering present-day examples of how a space patrol ship might be resourced and found myself being influenced by HMS Protector....
https://en.m.wikipedia.org/wiki/HMS_Protector_(A173).... the successor of HMS Endurance, with its interesting (for scenario purposes) mix of scientists and soldiers. Other influences for the Speeder's structure include the SWAT-type vehicles with manpower transported on external 'running boards' rather than inside an enclosed cabin and also the scenes in Black Hawk Down where the Little Birds hover on the target building and the Delta guys just step off the rails onto the roof.... a fluid and almost seamless transition from small, fast, mobile delivery platform to solid roof top.
Actually, the more I thought about it the more I realised that I was being influenced by the technological interactions of Black Hawk Down rather than Platoon. So taking that into the future (the sci-fi bit and bearing in mind the RIB analogy) leads me to where I am now.

Btw, last night I endeavoured to scratchbuild a two-man weapons platform for top cover, with functionality and role akin to the more heavily weaponised Little Birds that do the strafing runs in BHD. My scratchbuild was a big fail and after several hours entailing much cutting and gluing of plasticard I threw it in the bin. I expect that I shall just get the smaller GW Speeder for conversion into a top-cover fire-support platform.
Edited for typos