Ok jb604. finally back to you [ I do a long day !]
In relation to poly .... I had considered that for my first Fullcap, having been very happy with it on my toppers [ease of cleaning and attachment and it`s also very robust /hard -wearing] .... my reservation was that if I needed to trim the perimeter [and I often do so around the ears ] I just figured poly would be more tricky to work on....also, the hair is usually injected by machine into poly and may not always lie in the same manner as hair tied into lace,so you may have a variation in the ` look` of how the hair is lying ...I reckon the hair would lie ` flatter` at the nape [very important] when tied in by hand, onto lace --if you visualize a strip of poly...it wouldn`t be possible to have the hair injected in ` flat` --it would have a certain ` angle` to it and thus could tend to stick out at the back...you`d be forever ` conscious` of it. You could certainly go with a Swiss lace system but on the temple /flaps area you`d have to get a double-layer of it to help deal with the ` pressure` of detachments... a single layer could tend to rip /tear over time.
You can of course have mainly French with a Swiss lace front. I think though, that with the swept-back styles, that can put a certain amount of ` stress` on the lace ..the French lace will withstand that a bit more easily.I wear all French ---honestly it`s practically as ` light` as Swiss.
Once the ` exposed areas ` are bleached /single-knotted, I wouldn`t worry about the parted area ---- that won`t be very visible, especially a ` soft` parting... I think some guys stress a bit too much about knots....it`s never been an issue for me --not saying it hasn`t for others, and on a recent thread, a stock had very visible knots -- the factory usually does a good job...John will ensure they do a good job because with such an exposed style, knot-visibility would be a biggie.
Remember too ...hair taken from the back /crown of your head is darker than at the front ,so ensure you take separate samples and label them showing which is which.
No need to get a blonde front...well, I know some guys like to go that route and colour the hair for perfect knot invisibility....I think that would be too much for you to do at this stage....especially with brown hair ..there are just SO many shades of brown and if you go too ` deep` it`ll look off.....
I order bodywave...it`s just a little away from straight.
A first order can be nerve-wracking .... don`t expect everything to be spot-on.... densities may need ` tweaking` on a subsequent order for instance.
With such an exposed style, your template will need to be very accurate, particularly on the flaps/ temples......take your time with it..you`ll probably make tow, three or even four before you`re happy!!! It can be frustrating to get it correct.....always allow it to ` rest` for a few days before sending it off.......mine OFTEN shrunk or ` relaxed` in areas and I had to add more material to get it accurate again.
I`ll attach a few photos you may not have seen off an old thread...shows how I mark my skin with eyebrow pencil so I can see through the polythene film... I can then trace the line onto the film with indelible marker..... note too how ` low` my perimeter is at the nape area.

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Note on the first one, the flap is not lining -up accurately with the sideburn hair...I had to adjust that by adding more material ...also, the perimeter just immediately adjacent to the ear is too ` straight` ..had to ` tweak` that by adding a tiny bit more and then trimming a more ` curved` shape there ..