WTD 1 Brompton Marathon tyre +angel’s 26er build + carbon steerer bung please! + swap

I am being given a 26er jump bike by a forum angel. I thought I would build this SS to ride around burgess park and also to lend to my neighbour’s son who is into bikes and I think would appreciate it. I bought a pair of jump wheels which have a single cog and need a service and I am hopefully being given some brakes from another kind person on the forum. I have some cranks and hopefully a chainring, a stem, pedals (although it will mean I need a pair of basic pedals to put on my pub bike), maybe a seatpost, and some other little bits in the spares box. I’m trying to do this as much as possible through donations or as cheaply as possible. What i really need are matching tyres. I have one 2.4 rubber queen and another fat conti tyre to match would be good, or I also have a 2.10 maxxis advantage which would also need a friend (but is maybe a bit skinny for this bike). Perhaps you have something or a pair or 26er tyres that would suit? I also want to swap my 780mm super wide low rise freeride bars (which are a bright blue) for a hi rise pair more suited to a jump bike. These also need to be wide-ish but can be less wide than 780, say anything over 680 and OS?
Thinking about it the cog on the wheel is tiny so maybe I need something like a 24t front ring 104bcd no ramps).
I may have what you need for swaps so ask away, I currently don’t have the bandwidth to do a sale/swap thread with pics etc but will def help you help me if you have what i’m after.
Full list
SS chainring 104bcd 22-28t
bars
saddle
tyres
plastic/beater pedals
bmx style grips
potentially brake adapter but not sure which yet
Yours sincerely
Tom

can i give myself a bump for a total rewrite?

hey dude i think ive got some old odi grips and a mtb saddle you can have if you're still looking? will check tomorrow evening and am in SE4 for collection

Got a saddle there, lock on grips and dmr v12 pedals you can have. Collection tw152rb or can post

Got some kona bars and stem too i believe (31.8mm clamp)

wow, this is amazing, thank you both, will dm
edit, i believe I need a 30.0 mm seatpost. Apparently these are quite rare and only kona of this era did them

adding a request for a brompton schwable marathon plus tyre. 16” x 1.35. doesn’t have to be new. i reckon pairs are rare and desirable but singles might be cheap/available. i don’t know what the ‘plus’ signifies but if it is just the reflective bit then non-plus is fine, i’m non-plussed