`x = 50, y = 35, rule = B3/S23`

18bo$19bo$17b3o5$29bo$27b2o$28b2o$19bo$19b2o$18bobo$36bobo$36b2o$37bo

4$b2o$obo$2bo$34b2o$33b2o$35bo$29b2o$30b2o$29bo5$47b3o$47bo$48bo!

EDIT:

Jormungant wrote:I found an approach that may work for 16.1787 (aka xs16_069m4koz311); however, I don't know if there is a 3 or 4 glider construction for a transient group that has 7 cells at some point (found on the upper right).Code: Select all`x = 21, y = 23, rule = B3/S23`

13bo$11b2o$12b2o$7bo$7b2o9b3o$bo4bobo8bo$2b2o13bo2bo$b2o14bo2$10bo$9b

2o$9bobo$5b2o$4bobo$6bo4$b2o$obo$2bo11bo$14b2o$13bobo!

In 11G:

`x = 46, y = 43, rule = B3/S23`

31bo$30bo$30b3o3$bo$2bo$3o30bobo$33b2o$34bo5$33bobo$33b2o$29b2o3bo$28b

2o$30bo5$6b2o$5bobo$7bo$44b2o$43b2o$45bo$28b2o$28bobo$28bo$4b2o$5b2o$

4bo4$2o$b2o$o12b2o$12bobo$14bo!