NASA NIAC Spiderfab Status update on the way to making kilometer scale structures
Robert Hoyt, Tethers Unlimited - SpiderFab: Architecture for On-Orbit Construction of Kilometer-Scale Apertures
Two things are the most exciting for near term transformation of space capability
Spiderfab and Spacex reusable rockets.
Here is the Spiderfab update.
Improving and testing reliability and a lot of engineering would be needed to get to 100 kilometer structures.

(http://1.bp.blogspot.com/-t-aDFn_QwBo/VNsTdTD3DaI/AAAAAAAA61I/bPknJiWmjiY/s1600/spiderfabhorizon.png)

(http://2.bp.blogspot.com/-HZyQsgjGInI/VNsTYrlwOZI/AAAAAAAA61A/KIe3OU_brZI/s1600/largeantenna.png)

(http://4.bp.blogspot.com/---hUrtmlBVg/VNsUF28hlNI/AAAAAAAA61Y/CArDPdLB5j0/s1600/spiderfab4m.png)

(http://1.bp.blogspot.com/-c9U_aGqk3OU/VNsUWVZ3moI/AAAAAAAA61g/Z8TiZddRobM/s1600/spiderfabtrusselator.png)

(http://4.bp.blogspot.com/-bm6-Wpc-paw/VNsUs9xGx9I/AAAAAAAA61o/O7rgHAf0eIQ/s1600/trussdemo.png)
Making 6U cubesat trusselator to put out 50 meter trusses and make truss of trusses from several 
(http://3.bp.blogspot.com/-ZCZpLbgGY8A/VNsVQil3_fI/AAAAAAAA61w/7_nEzok752U/s1600/trussoftrusses.png)
They are using Baxter robot to work with trusselators.

(http://3.bp.blogspot.com/-dn9l3xj_Dkg/VNsVwyC9YEI/AAAAAAAA614/sWyAojEMyqw/s1600/baxterassemblytrusses.png)

(http://2.bp.blogspot.com/-pew1HLfjHCo/VNsWFzE1RAI/AAAAAAAA62A/_fK6AVNqn0M/s1600/motheroftelescopes.png)

(http://2.bp.blogspot.com/-A1C50m4Bv60/VNsWwbJGmWI/AAAAAAAA62I/YmHxGTfT4no/s1600/packingtrusses.png)

(http://4.bp.blogspot.com/-4xUrSoOSm_c/VNsWy4bMR_I/AAAAAAAA62Q/qrr_SIiPXno/s1600/cubesattruss.png)

(http://2.bp.blogspot.com/-IIx8yNsHKi0/VNsXdfhlk5I/AAAAAAAA62Y/zG8Y8ftGbJM/s1600/breadsizeto3trailers.png)

(http://3.bp.blogspot.com/-7WBtPN7kPwQ/VNsXmhrmkyI/AAAAAAAA62g/Hh_tUKpgx1s/s1600/spiderfabsummary.png)
Babak Saif, NASA GSFC - A Gravitational Wave Detector Based on an Atom Interferometer
видео:
http://new.livestream.com/viewnow/NIAC2015/videos/75183704
взято тут:
http://nextbigfuture.com/2015/02/nasa-niac-spiderfab-status-update-on.html
Я думаю, без 3Д-принтеров тут не обойтись. 8) Но пусть будет новая тема!